CH 1: Droughts and desertification
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Questions and Answers

What percentage of Earth's land area do drylands cover?

  • 41% (correct)
  • 55%
  • 30%
  • 20%

    • How are dryland ecosystems classified based on their aridity levels?

  • Tropical, temperate, arctic, and subarctic
  • Savannah, steppe, desert, and tundra
  • Hyperarid, arid, semiarid, and dry subhumid (correct)
  • Coastal, inland, mountainous, and forested

    • Which region experiences the highest frequency of droughts?

  • Equatorial areas
  • Australia
  • Southwestern USA
  • The Sahel region in Africa (correct)

    • What is the definition of a 'socio-economic drought'?

    <p>Inability to meet water demands affecting society and economy</p> Signup and view all the answers

    Which type of drought results from insufficient soil moisture affecting crops?

    <p>Agricultural Drought</p> Signup and view all the answers

    What are the risks associated with drought and desertification in dryland ecosystems?

    <p>Degraded land, reduced agricultural productivity, increased poverty, and environmental migration</p> Signup and view all the answers

    Which continent experiences notable long-term occurrences of drought in regions like Australia and the southwestern USA?

    <p>All continents</p> Signup and view all the answers

    What is the primary reason for desertification according to the text?

    <p>Climate change</p> Signup and view all the answers

    How does desertification affect food security?

    <p>Reduces agricultural yields</p> Signup and view all the answers

    What contributes to biodiversity loss as a consequence of desertification?

    <p>Inadequate knowledge</p> Signup and view all the answers

    Why is rehabilitation of degraded lands challenging?

    <p>Lack of funding</p> Signup and view all the answers

    Which human activity is an indirect cause of desertification?

    <p>Inadequate knowledge</p> Signup and view all the answers

    How do unsustainable agricultural practices contribute to desertification?

    <p>By causing land degradation</p> Signup and view all the answers

    What role do sustainable resource use strategies play in preventing desertification?

    <p>They contribute to desertification prevention</p> Signup and view all the answers

    Why is desertification considered a significant threat to livelihoods?

    <p>It reduces agricultural yields</p> Signup and view all the answers

    What is the primary reason for the classification of dryland ecosystems into hyperarid, arid, semiarid, and dry subhumid areas?

    <p>To address the unique challenges faced by each category</p> Signup and view all the answers

    What is a primary direct cause of desertification?

    <p>Climate change</p> Signup and view all the answers

    How does overgrazing contribute to desertification?

    <p>Reduces biodiversity</p> Signup and view all the answers

    Which type of drought is characterized by long periods of below-average rainfall?

    <p>Meteorological Drought</p> Signup and view all the answers

    What is a consequence of desertification at a global scale?

    <p>Contributes to biodiversity loss</p> Signup and view all the answers

    What is the global extent of drought, as described in the text?

    <p>Drought affects all continents worldwide</p> Signup and view all the answers

    Why does the Sahel region in Africa have the highest frequency of droughts?

    <p>Because it is an arid region with limited rainfall</p> Signup and view all the answers

    Why is awareness important in combating desertification?

    <p>Encourages sustainable resource use</p> Signup and view all the answers

    What are the risks collectively confronted by dryland ecosystems due to drought and desertification?

    <p>Degraded land, reduced agricultural productivity, and increased poverty</p> Signup and view all the answers

    How do unsustainable agricultural practices affect desertification?

    <p>Lead to soil degradation</p> Signup and view all the answers

    What is a consequence of desertification on agricultural yields?

    <p>Decrease in yields</p> Signup and view all the answers

    In what way does socio-economic drought differ from meteorological drought?

    <p>Socio-economic drought is related to water demands affecting society and economy</p> Signup and view all the answers

    What is the significance of classifying drylands into different aridity levels?

    <p>To better understand and address the diverse challenges faced by each type of ecosystem</p> Signup and view all the answers

    Why does desertification pose a threat to food security?

    <p>Reduces arable land availability</p> Signup and view all the answers

    How does desertification impact economies locally and nationally?

    <p>Threatens economies by reducing agricultural yields</p> Signup and view all the answers

    What is the primary factor that determines the categorization of dryland ecosystems?

    <p>Amount of rainfall</p> Signup and view all the answers

    Which type of drought is characterized by the inability to meet water demands affecting society and the economy?

    <p>Socio-economic Drought</p> Signup and view all the answers

    In which region does drought occur most frequently according to the text?

    <p>Sahel region in Africa</p> Signup and view all the answers

    What is the main consequence of drought on agricultural activities?

    <p>Lower crop yield</p> Signup and view all the answers

    Why is desertification a significant concern for the environment?

    <p>It leads to land degradation</p> Signup and view all the answers

    How does unsustainable agricultural practices contribute to drought?

    <p>By depleting soil moisture</p> Signup and view all the answers

    Which dryland ecosystem classification faces the most severe challenges according to the text?

    <p>Hyperarid areas</p> Signup and view all the answers

    What role do sustainable resource use strategies play in preventing desertification?

    <p>Preventing further land degradation</p> Signup and view all the answers

    How does desertification impact economies locally and nationally?

    <p>Reduces agricultural productivity</p> Signup and view all the answers

    Which of the following is an indirect cause of desertification?

    <p>Inadequate knowledge</p> Signup and view all the answers

    Why is awareness crucial in combating desertification?

    <p>To foster environmental stewardship</p> Signup and view all the answers

    How do unsustainable agricultural practices affect desertification?

    <p>By increasing land degradation</p> Signup and view all the answers

    Which continent experiences notable long-term occurrences of drought in regions like Australia and the southwestern USA?

    <p>North America</p> Signup and view all the answers

    What contributes to biodiversity loss as a consequence of desertification?

    <p>Overgrazing</p> Signup and view all the answers

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