World deserts cover roughly one-third of Earth’s land surface, characterized by extreme aridity, high evaporation rates, and specialized ecological adaptations. Classified into hot subtropical deserts, cold winter deserts, coastal fog deserts, and rain shadow deserts, these regions are shaped by global atmospheric circulation, high-pressure subsidence, and continental rain shadows. Understanding desert locations, formation mechanisms, and distinctive landforms like ergs, regs, and salt pans is essential for physical geography, climatology, and competitive examinations.
1. Which of the following is the largest desert in the world?
Correct Answer: c) Antarctic Desert
Explanation:
The Antarctic Desert is the largest desert in the world, covering the entire continent of Antarctica. Deserts are defined by their low precipitation (less than 250 mm annually), not by their temperature.
2. Which desert is the largest hot desert in the world?
Correct Answer: b) Sahara Desert
Explanation:
The Sahara Desert in North Africa is the world's largest hot desert, covering roughly 9.2 million square kilometers.
3. Which desert is widely considered the driest non-polar desert in the world?
Correct Answer: a) Atacama Desert
Explanation:
The Atacama Desert in South America, particularly in Chile, is the driest non-polar desert, with some areas having no recorded rainfall for decades.
4. The Gobi Desert is primarily located in which two countries?
Correct Answer: b) China and Mongolia
Explanation:
The Gobi Desert spans vast regions of northern China and southern Mongolia. It is a cold desert known for its extreme temperature fluctuations.
5. Which desert is considered the oldest in the world, existing for at least 55 million years?
Correct Answer: c) Namib Desert
Explanation:
The Namib Desert along the coast of Namibia, Angola, and South Africa is widely regarded as the oldest desert in the world, having endured arid conditions for 55 to 80 million years.
6. The Rub' al Khali, one of the largest sand deserts in the world, translates to what in English?
Correct Answer: c) The Empty Quarter
Explanation:
Rub' al Khali translates to 'The Empty Quarter' in Arabic. It is the largest continuous sand desert in the world, located in the southern Arabian Peninsula.
7. The Thar Desert forms a natural boundary between which two countries?
Correct Answer: c) India and Pakistan
Explanation:
The Thar Desert, also known as the Great Indian Desert, lies mostly in the Indian state of Rajasthan and extends into the Punjab and Sindh provinces of Pakistan.
8. Which desert is located in the Tarim Basin of Northwest China and is famous for its shifting sand dunes?
Correct Answer: b) Taklamakan Desert
Explanation:
The Taklamakan Desert is located in the Xinjiang region of China. Its name is popularly said to mean 'go in and you won't come out' due to its treacherous, shifting dunes.
9. The Kalahari Desert covers large parts of Botswana, Namibia, and which other country?
Correct Answer: a) South Africa
Explanation:
The Kalahari Desert is a large semi-arid sandy savanna in Southern Africa extending largely into Botswana, Namibia, and South Africa.
10. The Patagonian Desert is the largest desert in South America. In which country is it primarily located?
Correct Answer: b) Argentina
Explanation:
The Patagonian Desert is a large cold winter desert located primarily in Argentina, bordered by the Andes to the west.
11. What is the largest desert in Australia?
Correct Answer: c) Great Victoria Desert
Explanation:
The Great Victoria Desert is the largest desert in Australia, consisting of many small sandhills, grassland plains, areas with a closely packed surface of pebbles, and salt lakes.
12. The famous Joshua Tree (Yucca brevifolia) is an indicator species for which North American desert?
Correct Answer: d) Mojave Desert
Explanation:
The Mojave Desert is famously identified by the presence of the Joshua Tree, which is native to this region of the southwestern United States.
13. Which desert is known as the exclusive natural habitat of the giant Saguaro cactus?
Correct Answer: b) Sonoran Desert
Explanation:
The Sonoran Desert, which covers parts of Arizona, California, and Northwestern Mexico, is the only place in the world where the Saguaro cactus grows naturally.
14. Which of the following is the largest desert in North America?
Correct Answer: d) Chihuahuan Desert
Explanation:
The Chihuahuan Desert is the largest desert in North America, covering over 500,000 square kilometers across the southwestern US and northern Mexico.
15. The Great Basin Desert is distinct from other major North American deserts primarily because it is a:
Correct Answer: a) Cold desert
Explanation:
The Great Basin Desert is a cold winter desert, characterized by high elevations and cold temperatures, with most of its precipitation falling as snow.
16. Which Australian desert is renowned for its vast parallel red sand dunes?
Correct Answer: b) Simpson Desert
Explanation:
The Simpson Desert in central Australia is famous for containing the world's longest parallel sand dunes, which are distinctly red in color.
17. The Dasht-e Lut, a large salt desert holding records for some of the highest land surface temperatures on Earth, is located in:
Correct Answer: c) Iran
Explanation:
The Dasht-e Lut (Lut Desert) is a vast desert in southeastern Iran. NASA satellites have recorded land surface temperatures there as high as 70.7°C (159.3°F).
18. The Dasht-e Kavir is often referred to by what descriptive name?
Correct Answer: a) The Great Salt Desert
Explanation:
Dasht-e Kavir, located in the central plateau of Iran, is widely known as the Great Salt Desert due to its extensive salt crusts and marshes.
19. The Karakum Desert, which occupies about 70 percent of Turkmenistan, translates to what?
Correct Answer: b) Black Sand
Explanation:
Karakum means 'Black Sand' in Turkic languages. It covers most of Turkmenistan and is known for the Darvaza gas crater.
20. The Kyzylkum Desert, located in Uzbekistan, Kazakhstan, and Turkmenistan, translates to what?
Correct Answer: c) Red Sand
Explanation:
Kyzylkum means 'Red Sand' in Turkic languages. It lies between the Amu Darya and Syr Darya rivers in Central Asia.
21. The Arabian Desert covers nearly the entirety of which country?
Correct Answer: c) Saudi Arabia
Explanation:
While it extends into several nations, the Arabian Desert covers almost the entire landmass of Saudi Arabia.
22. The Syrian Desert is a unique combination of steppe and true desert located in which region?
Correct Answer: b) Middle East
Explanation:
The Syrian Desert covers parts of Syria, Jordan, Iraq, and Saudi Arabia in the Middle East.
23. In desert geography, an 'erg' is defined as:
Correct Answer: c) A broad, flat area covered with wind-swept sand
Explanation:
An erg, also known as a sand sea, is a broad, flat area of desert covered with wind-swept sand and minimal vegetative cover.
24. In desert geography, a 'reg' (or desert pavement) is primarily composed of:
Correct Answer: b) Gravel, pebbles, and closely packed stones
Explanation:
A reg is a desert surface covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size.
25. A 'hamada' refers to which type of desert landscape?
Correct Answer: b) A high, barren, hard rocky plateau
Explanation:
A hamada is a type of desert landscape consisting of high, largely barren, hard rocky plateaus with very little sand.
26. What is a 'wadi'?
Correct Answer: c) A dry riverbed that contains water only during times of heavy rain
Explanation:
A wadi is the Arabic term traditionally referring to a valley or a dry riverbed that contains water only when heavy rain occurs.
27. What shape is a barchan sand dune?
Correct Answer: b) Crescent-shaped
Explanation:
A barchan is a crescent-shaped sand dune produced by the action of wind blowing predominantly from one direction.
28. A longitudinal sand dune that forms in long, straight ridges parallel to the wind direction is called a:
Correct Answer: a) Seif dune
Explanation:
A seif (Arabic for sword) is a linear or longitudinal dune that forms long ridges parallel to the prevailing wind direction.
29. Star dunes, which have a pyramidal shape with multiple arms, are formed under what conditions?
Correct Answer: b) Winds blowing from multiple, shifting directions
Explanation:
Star dunes form in areas where the wind regime is complex and blows from multiple directions, causing the sand to pile up into a central peak with extending arms.
30. What naturally creates a desert oasis?
Correct Answer: b) Underground aquifers reaching the surface
Explanation:
An oasis is created when an underground water source, such as an aquifer or a spring, reaches the surface, allowing vegetation and life to thrive in a desert.
31. Why is the Kalahari Desert sometimes considered a semi-desert rather than a true desert?
Correct Answer: b) It receives more rainfall (up to 20 inches in parts) than a true desert.
Explanation:
Parts of the Kalahari receive between 5 to 20 inches of rain annually, supporting savanna vegetation, making it technically a semi-desert in those areas.
32. The extreme aridity of the Atacama Desert is caused by a combination of the rain shadow of the Andes Mountains and which ocean current?
Correct Answer: c) The cold Humboldt Current
Explanation:
The cold Humboldt (or Peru) Current chills the air above the Pacific Ocean, preventing the formation of precipitation, which, combined with the Andes rain shadow, makes the Atacama hyper-arid.
33. The transition zone of semi-arid grassland south of the Sahara Desert, which is highly vulnerable to desertification, is called the:
Correct Answer: b) Sahel
Explanation:
The Sahel is the ecoclimatic and biogeographic realm of transition in Africa between the Sahara Desert to the north and the Sudanian savanna to the south.
34. Excluding the polar regions, which is the largest cold desert in the world?
Correct Answer: b) Gobi Desert
Explanation:
The Gobi Desert is the largest cold winter desert in the world, excluding the Arctic and Antarctic polar deserts.
35. The Taklamakan Desert is famously bounded to the south by which mountain range?
Correct Answer: c) The Kunlun Mountains
Explanation:
The Taklamakan Desert is bounded by the Kunlun Mountains to the south, the Pamir Mountains to the west, and the Tien Shan to the north.
36. The Danakil Depression, known for extreme heat, active volcanoes, and toxic hot springs, is located in which country?
Correct Answer: a) Ethiopia
Explanation:
The Danakil Depression is located in the Afar Triangle of Ethiopia and is one of the hottest, most inhospitable places on Earth.
37. The White Desert (Sahara el Beyda), famous for its massive, chalky rock formations that look like mushrooms, is located in:
Correct Answer: c) Egypt
Explanation:
The White Desert is a national park in Egypt, located north of the Farafra Oasis, famous for its brilliant white chalk rock formations created by wind erosion.
38. The Pinnacles Desert, featuring thousands of weathered limestone pillars rising out of yellow sand, is located in which country?
Correct Answer: b) Australia
Explanation:
The Pinnacles Desert is located within Nambung National Park in Western Australia and is famous for its unique limestone spires.
39. The Painted Desert, known for its brilliant and varied colors of barren badlands, is located in which U.S. state?
Correct Answer: d) Arizona
Explanation:
The Painted Desert is located in the Four Corners region of Northern Arizona, characterized by colorful bands of the Chinle Formation.
40. The Black Rock Desert, an expansive dry lake bed known for hosting the Burning Man festival and land speed records, is in:
Correct Answer: a) Nevada
Explanation:
The Black Rock Desert is a semi-arid region in northwestern Nevada, famous for its massive, flat playa.
41. Geographically, a region is typically classified as a desert if it receives less than how much precipitation annually?
Correct Answer: b) 250 mm (10 inches)
Explanation:
A common geographical definition of a desert is an area that receives less than 250 millimeters (about 10 inches) of precipitation per year.
42. What is a 'xerophyte'?
Correct Answer: b) A plant adapted to survive in an environment with very little liquid water
Explanation:
Xerophytes (from Greek xero meaning dry, and phuton meaning plant) are plants physically adapted to survive in dry environments like deserts.
43. Desert plants that have extremely deep root systems to tap into the groundwater table are known as:
Correct Answer: c) Phreatophytes
Explanation:
Phreatophytes are deep-rooted plants, like the mesquite tree, that obtain a significant portion of their water from the phreatic zone (zone of saturation) or capillary fringe.
44. What are desert 'ephemerals'?
Correct Answer: b) Plants that complete their life cycle very quickly after a rainstorm
Explanation:
Ephemeral plants remain dormant as seeds for months or years, only germinating, blooming, and dying within a few weeks after a significant rainfall.
45. Plants like cacti and aloes that have thick, fleshy stems or leaves adapted to store water are called:
Correct Answer: a) Succulents
Explanation:
Succulents possess specialized tissues that allow them to store large quantities of water in their leaves, stems, or roots to survive arid conditions.
46. Many desert plants use CAM (Crassulacean acid metabolism) photosynthesis. What is its primary advantage?
Correct Answer: b) It allows stomata to open at night to minimize water loss.
Explanation:
CAM photosynthesis is an adaptation where plants open their stomata at night to absorb carbon dioxide when temperatures are cooler, drastically reducing water loss from transpiration.
47. What is the primary substance stored in a camel's hump?
Correct Answer: b) Fat
Explanation:
A camel's hump stores fat, which serves as a reserve of energy. When the fat is metabolized, it also produces water as a byproduct.
48. The fennec fox, native to the Sahara Desert, is most famous for which physical adaptation?
Correct Answer: c) Oversized ears to dissipate heat
Explanation:
The fennec fox has exceptionally large ears radiating body heat to help it stay cool in the extreme desert temperatures, while also providing excellent hearing.
49. Which desert animal is famous for its ability to survive its entire life without drinking any liquid water?
Correct Answer: a) Kangaroo rat
Explanation:
The kangaroo rat has highly efficient kidneys and gets all the moisture it needs entirely from the seeds it eats, allowing it to survive without ever drinking liquid water.
50. The Namib Desert receives a significant portion of its moisture from:
Correct Answer: b) Coastal fog rolls moving inland
Explanation:
The cold Benguela Current creates dense coastal fogs that roll inland over the Namib Desert. Many unique plants and insects harvest water directly from this fog.
51. The Gobi Desert is formed primarily because it lies in the rain shadow of which mountain range?
Correct Answer: c) The Himalayas
Explanation:
The Himalayas block rain-carrying clouds from the Indian Ocean from reaching the Gobi region, creating a massive rain shadow.
52. The Patagonian Desert is extremely arid due to the rain shadow cast by which mountain range?
Correct Answer: c) The Andes
Explanation:
The Andes Mountains block moisture-laden westerly winds from the Pacific Ocean, causing the Patagonian Desert in Argentina to be extremely dry.
53. The Great Basin Desert in the United States exists in the rain shadow of which mountain range?
Correct Answer: c) The Sierra Nevada
Explanation:
The Sierra Nevada mountain range blocks moisture from the Pacific Ocean from moving eastward, creating the dry conditions of the Great Basin Desert.
54. The Sonoran Desert covers parts of the United States and which other country?
Correct Answer: b) Mexico
Explanation:
The Sonoran Desert spans parts of Arizona and California in the US, and the states of Sonora, Baja California, and Baja California Sur in Mexico.
55. Death Valley, one of the hottest places on Earth, is located primarily within which desert?
Correct Answer: a) Mojave Desert
Explanation:
Death Valley is a desert valley located in Eastern California, situated in the northern Mojave Desert.
56. What extreme geographical record does Death Valley hold?
Correct Answer: b) The highest reliably recorded air temperature on Earth
Explanation:
Furnace Creek in Death Valley holds the record for the highest reliably recorded air temperature on Earth at 56.7°C (134°F) measured in 1913.
57. Which plant is an iconic and dominant species of the Chihuahuan Desert?
Correct Answer: c) Lechuguilla (an agave)
Explanation:
Agave lechuguilla is an indicator species of the Chihuahuan Desert, dominating much of its rocky limestone terrain.
58. The Great Salt Lake Desert is located in which U.S. state?
Correct Answer: b) Utah
Explanation:
The Great Salt Lake Desert, known for the Bonneville Salt Flats, is located in northern Utah, west of the Great Salt Lake.
59. Salar de Uyuni, the world's largest salt flat, is a high-altitude desert landscape located in which country?
Correct Answer: d) Bolivia
Explanation:
Salar de Uyuni is located in southwest Bolivia, sitting at an elevation of nearly 3,656 meters (11,995 feet) above sea level.
60. The Sechura Desert is a coastal desert located along the Pacific Ocean in which South American country?
Correct Answer: c) Peru
Explanation:
The Sechura Desert is located in the Piura Region of Peru, running along the Pacific coast.
61. The Monte Desert is a South American desert lying mainly in which country?
Correct Answer: a) Argentina
Explanation:
The Monte Desert is situated in Argentina, located north of the Patagonian Desert and east of the Andes Mountains.
62. The Gibson Desert, characterized by gravel-covered plains and desert grasses, is located in which country?
Correct Answer: b) Australia
Explanation:
The Gibson Desert is located in the central state of Western Australia, sitting between the Great Sandy Desert and the Great Victoria Desert.
63. The Great Sandy Desert is the second-largest desert in which country?
Correct Answer: b) Australia
Explanation:
The Great Sandy Desert is located in northwestern Australia and is the country's second-largest desert after the Great Victoria Desert.
64. Which desert lies immediately south of the Great Sandy Desert in Western Australia?
Correct Answer: a) The Little Sandy Desert
Explanation:
The Little Sandy Desert is located in Western Australia, directly to the south of the Great Sandy Desert, and shares similar terrain.
65. The Tanami Desert, noted for being one of the most isolated and arid places on Earth, is located in:
Correct Answer: b) Australia
Explanation:
The Tanami Desert is situated in the Northern Territory and Western Australia. It features rocky terrain mixed with sand.
66. The Strzelecki Desert is located in Australia and is famously crossed by which historic track?
Correct Answer: c) The Strzelecki Track
Explanation:
The Strzelecki Desert in South Australia, Queensland, and New South Wales is traversed by the historic and rugged Strzelecki Track.
67. Sturt Stony Desert in Australia is best known for what type of terrain?
Correct Answer: c) Gibber plains (stone-covered plains)
Explanation:
Sturt Stony Desert is characterized by gibber plains, which are desert pavements covered with closely packed, polished stones.
68. The Rub' al Khali is the major portion of which larger desert system?
Correct Answer: b) The Arabian Desert
Explanation:
The Rub' al Khali (Empty Quarter) constitutes the vast southern portion of the larger Arabian Desert.
69. An Nafud is a desert known for its sudden winds and reddish crescent-shaped dunes located in:
Correct Answer: a) Northern Saudi Arabia
Explanation:
An Nafud (or Al-Nefud) is a desert in the northern part of the Arabian Peninsula in Saudi Arabia, known for its reddish sands.
70. The Wahiba Sands (also known as Sharqiya Sands) is a desert region in which country?
Correct Answer: b) Oman
Explanation:
The Wahiba Sands are a vast region of dunes located in the Sultanate of Oman, known for their distinct copper and orange sands.
71. The Negev Desert covers more than half of the land area of which country?
Correct Answer: c) Israel
Explanation:
The Negev Desert is a rocky, dry region covering approximately 55% of Israel's southern territory.
72. The Judean Desert lies east of Jerusalem and descends abruptly to which body of water?
Correct Answer: d) The Dead Sea
Explanation:
The Judean Desert is a small, rugged desert that drops steeply in elevation, ending at the shores of the Dead Sea.
73. The Sinai Desert is located on the Sinai Peninsula, which belongs to which country?
Correct Answer: a) Egypt
Explanation:
The Sinai Peninsula, consisting largely of the Sinai Desert, is a geographically Asian territory belonging to Egypt.
74. In Egypt, the region of the Sahara situated between the Nile River and the Red Sea is known as:
Correct Answer: b) The Eastern Desert
Explanation:
The Eastern Desert of Egypt is the section of the Sahara Desert located east of the Nile River, extending to the Red Sea.
75. The Western Desert of Egypt is geographically a part of which larger desert?
Correct Answer: b) The Libyan Desert
Explanation:
The Western Desert of Egypt lies west of the Nile and is essentially the eastern portion of the vast Libyan Desert, one of the most arid parts of the Sahara.
76. The Libyan Desert covers parts of Libya, Egypt, and which other country?
Correct Answer: c) Sudan
Explanation:
The Libyan Desert, the northeastern portion of the Sahara, covers eastern Libya, western Egypt, and northwestern Sudan.
77. The Nubian Desert is located in the northeastern part of which country?
Correct Answer: c) Sudan
Explanation:
The Nubian Desert is located in northeastern Sudan, situated between the Nile River and the Red Sea.
78. The Chalbi Desert is a small desert located in the northern part of which African nation?
Correct Answer: b) Kenya
Explanation:
The Chalbi Desert is located in northern Kenya, near the border with Ethiopia, east of Lake Turkana.
79. The Nyiri Desert (or Taru Desert) is located in southern Kenya in the rain shadow of which famous mountain?
Correct Answer: c) Mount Kilimanjaro
Explanation:
The Nyiri Desert is an arid region in southern Kenya caused by the rain shadow cast by Mount Kilimanjaro.
80. The Karoo is a semi-desert region characterized by low rainfall and extreme temperatures, primarily located in:
Correct Answer: b) South Africa
Explanation:
The Karoo is a vast semi-desert natural region in South Africa, divided into the Great Karoo and the Succulent Karoo.
81. The Tengger Desert is located in the Inner Mongolia autonomous region of which country?
Correct Answer: b) China
Explanation:
The Tengger Desert is located in the Inner Mongolia autonomous region and Gansu province of China.
82. Which Chinese desert is famous for having some of the tallest stationary sand dunes on Earth, interspersed with numerous groundwater-fed lakes?
Correct Answer: a) Badain Jaran Desert
Explanation:
The Badain Jaran Desert in China features megadunes that can reach over 400 meters high, uniquely anchored by groundwater that surfaces as dozens of small lakes.
83. The Ordos Desert is almost completely encircled by the great bend of which major river?
Correct Answer: c) Yellow River
Explanation:
The Ordos Desert is a desert and steppe region in China enclosed by the vast northern bend (Ordos Loop) of the Yellow River.
84. The Lop Desert, located in the eastern Tarim Basin, is well-known historically as a site for what?
Correct Answer: b) China's nuclear weapons testing base
Explanation:
The Lop Desert (Lop Nur) was used by China as a nuclear testing site for several decades.
85. The Cholistan Desert adjoins the Thar Desert and is located in which country?
Correct Answer: c) Pakistan
Explanation:
The Cholistan Desert is located in the Punjab province of Pakistan and forms a contiguous desert region with the Thar Desert in India.
86. The Thal Desert is situated between the Indus and Jhelum rivers in which country?
Correct Answer: b) Pakistan
Explanation:
The Thal Desert is situated in the Punjab province of Pakistan, in the doab (land between two rivers) of the Indus and Jhelum rivers.
87. Dasht-e Margo, which translates to 'Desert of Death', is located in the southern part of which country?
Correct Answer: b) Afghanistan
Explanation:
Dasht-e Margo is a desert region in the southern provinces of Helmand and Nimruz in Afghanistan.
88. The Registan Desert is a plateau of red sand dunes located primarily in which country?
Correct Answer: c) Afghanistan
Explanation:
The Registan Desert is an extremely arid plateau region consisting of red sand dunes situated in southern Afghanistan.
89. What does the name 'Kyzylkum' literally translate to?
Correct Answer: b) Red Sand
Explanation:
In Turkic languages, Kyzylkum translates to 'Red Sand', describing the desert located in Central Asia.
90. What does the name 'Karakum' literally translate to?
Correct Answer: a) Black Sand
Explanation:
In Turkic languages, Karakum translates to 'Black Sand'. It covers a vast portion of Turkmenistan.
91. Which of the following is often considered mainland Europe's only true desert?
Correct Answer: b) The Tabernas Desert
Explanation:
The Tabernas Desert in the province of Almeria, Spain, is generally considered mainland Europe's only true semi-arid desert, famously used as a filming location for 'Spaghetti Westerns'.
92. The Oleshky Sands, one of the largest expanses of sand in Europe, is located in which country?
Correct Answer: c) Ukraine
Explanation:
The Oleshky Sands is a huge expanse of sand located in the Kherson Oblast of southern Ukraine.
93. The Rangipo Desert in New Zealand owes its desert-like, barren appearance primarily to:
Correct Answer: b) High altitude and frequent volcanic eruptions
Explanation:
Despite receiving high rainfall, the Rangipo Desert on New Zealand's North Island is barren due to poor soil quality from frequent volcanic eruptions from nearby Mount Ruapehu and harsh alpine winds.
94. The Chihuahuan Desert stands out from the Sonoran and Mojave deserts primarily because:
Correct Answer: a) It sits at a much higher average elevation, leading to cooler winters.
Explanation:
The Chihuahuan Desert is a high-altitude desert, generally sitting between 3,000 and 5,000 feet, making its winters much cooler than the lower Mojave and Sonoran deserts.
95. In desert geology, what is 'loess'?
Correct Answer: c) A wind-blown deposit of fine silt and clay
Explanation:
Loess is an unstratified, geologically recent deposit of silty or loamy material that is usually highly calcareous, deposited by the wind, often originating from desert regions.
96. What creates a 'desert pavement'?
Correct Answer: c) Wind and water stripping away fine sand and dust, leaving only interlocking stones behind
Explanation:
Desert pavement (or reg) forms when deflation (wind erosion) and water runoff remove fine-grained material, leaving behind a tightly packed layer of pebbles and cobbles.
97. What is a 'ventifact'?
Correct Answer: b) A rock that has been abraded, pitted, or polished by wind-driven sand
Explanation:
A ventifact is a stone or rock that has had its surface carved, polished, or faceted by the abrasive action of windblown sand.
98. A 'yardang' is a desert feature that can be described as:
Correct Answer: b) A streamlined, wind-eroded ridge of rock
Explanation:
A yardang is a sharp irregular ridge of compact sand or rock lying in the direction of the prevailing wind in exposed desert regions, formed by wind erosion.
99. In the context of deserts, what is a 'playa'?
Correct Answer: b) A flat, dry lakebed in a desert basin that may occasionally fill with water
Explanation:
A playa is an extremely flat, dry lakebed at the lowest part of a desert basin. Water may briefly collect there after rains, evaporating quickly to leave salt flats.
100. Which of the following is the primary human-driven cause of desertification?
Correct Answer: b) Overgrazing, deforestation, and poor agricultural practices
Explanation:
Desertification is the degradation of land in arid and semi-arid areas, primarily driven by human activities like overgrazing, deforestation, and unsustainable farming, exacerbated by climate change.
