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Deserts

30 cards · 🇺🇸 English

The world's major deserts and what defines them.

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What defines a desert?

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  1. 1What defines a desert?
    Region receiving less than 250mm (10 inches) of precipitation annually; characterized by extreme temperatures, sparse vegetation, and low humidity
  2. 2What are the four main types of deserts?
    Hot and dry (subtropical), semiarid, coastal, and cold deserts - classified by climate, location, and temperature patterns
  3. 3What is the largest hot desert in the world?
    Sahara Desert in North Africa (~9 million km²) - larger than continental United States
  4. 4What is the largest desert overall (including cold deserts)?
    Antarctic Desert (~14 million km²) - technically a polar desert; driest continent with very low precipitation
  5. 5What causes rain shadow deserts?
    Mountain ranges block moisture-laden winds; air rises, cools and precipitates on windward side, leaving dry air on leeward side (e.g., Atacama)
  6. 6What is the Atacama Desert known for?
    Driest non-polar desert on Earth (Chile); some areas have never recorded rainfall; extreme aridity due to rain shadow and cold ocean currents
  7. 7Where is the Gobi Desert located and what type is it?
    Mongolia and northern China; cold desert with temperature extremes (-40°C to 50°C); rain shadow from Himalayas
  8. 8What is the Arabian Desert and where is it located?
    Large desert covering Arabian Peninsula (Saudi Arabia, Yemen, Oman, UAE); subtropical hot desert with Rub' al Khali (Empty Quarter)
  9. 9What is the Kalahari Desert characterized by?
    Large semi-arid sandy savanna in southern Africa (Botswana, Namibia, South Africa); receives more rain than true deserts (125-250mm)
  10. 10What are the major deserts of North America?
    Mojave (contains Death Valley), Sonoran (cacti), Chihuahuan (largest), and Great Basin (cold desert) - southwestern US and Mexico
  11. 11What is the Patagonian Desert?
    Cold desert in southern Argentina; largest desert in Americas; rain shadow from Andes Mountains
  12. 12What causes subtropical deserts to form?
    Located around 30° latitude (N/S); descending air in Hadley cell circulation warms and dries, preventing cloud formation (e.g., Sahara, Australian deserts)
  13. 13What are coastal deserts and what causes them?
    Form along western coasts with cold ocean currents; cold water stabilizes air, preventing precipitation (e.g., Namib, Atacama)
  14. 14What is the Namib Desert known for?
    Coastal desert in Namibia; oldest desert (~55 million years); famous for towering sand dunes and fog that sustains unique life
  15. 15What adaptations do desert plants have?
    Deep/wide roots, water storage (succulents), small leaves, waxy coatings, spines, CAM photosynthesis, dormancy during drought
  16. 16What is an oasis?
    Isolated fertile area in desert with water source (spring, well, or underground aquifer); supports vegetation and human settlement
  17. 17What are ergs in deserts?
    Large areas covered by sand dunes (sand seas); only ~20-30% of deserts are sandy - most are rocky or gravel plains
  18. 18What is a wadi (or arroyo/wash)?
    Dry riverbed or valley that fills with water during rare rainfall events; can cause flash floods
  19. 19What are desert pavements?
    Surface layer of closely packed stones/pebbles formed by wind erosion removing fine particles; protects underlying soil
  20. 20What is desertification?
    Process where fertile land becomes desert due to drought, deforestation, overgrazing, poor irrigation - often human-caused
  21. 21What is the temperature range in hot deserts?
    Extreme diurnal variation: daytime 35-50°C (95-122°F), nighttime can drop to 0°C or below due to lack of moisture and cloud cover
  22. 22What desert animals' adaptations include?
    Nocturnal behavior, water conservation (concentrated urine), burrowing, large ears (heat dissipation), light coloring, estivation
  23. 23What is the Great Victoria Desert?
    Largest desert in Australia (~350,000 km²); sandy desert with parallel dune systems; extremely remote and sparsely populated
  24. 24What is unique about Death Valley?
    Hottest, driest, lowest place in North America; record 56.7°C (134°F); 86m below sea level; in Mojave Desert, California
  25. 25What are monsoon deserts?
    Deserts affected by seasonal winds but remain arid; brief wet season followed by long dry periods (e.g., Thar Desert, India)
  26. 26What is the Taklamakan Desert?
    One of largest sandy deserts in China (Xinjiang); name means 'place of no return'; surrounded by mountains; extremely arid
  27. 27How do cold ocean currents create deserts?
    Cool air masses, prevent evaporation and cloud formation; Humboldt Current creates Atacama; Benguela Current creates Namib
  28. 28What percentage of Earth's land surface is desert?
    Approximately 33% (one-third) of Earth's land area; hot deserts ~12%, cold deserts ~21%
  29. 29What are playa lakes (salt flats)?
    Temporary lakes in desert basins that evaporate, leaving flat salt/mineral deposits; examples: Salar de Uyuni, Bonneville Salt Flats
  30. 30How do humans traditionally survive in deserts?
    Nomadic lifestyle, oases settlement, water conservation, light clothing, nocturnal activity, knowledge of water sources, animal husbandry (camels)

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