Desertification - Causes and Solutions (OCR GCSE Geography A (Geographical Themes)): Flashcards
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What is desertification?
What is desertification?
Land becoming drier, more desert-like & less productive
What proportion of world's land is at risk of desertification?
What proportion of world's land is at risk of desertification?
A third
Famous area at risk from desertification in Africa
Famous area at risk from desertification in Africa
The Sahel (below Sahara Desert)
How climate change affects rainfall in dry areas
How climate change affects rainfall in dry areas
Reduces rainfall in already dry areas
Effect of higher temperatures on water & plants
Effect of higher temperatures on water & plants
More water evaporates from land & plants
How overgrazing causes desertification
How overgrazing causes desertification
Cattle eat plants faster than regrowth; soil erosion results
How over-cultivation causes desertification
How over-cultivation causes desertification
Continuous cropping uses up all soil nutrients; plants can't grow
What is salinization?
What is salinization?
Salts drawn to surface by evaporation; toxic to plants
How afforestation helps prevent desertification
How afforestation helps prevent desertification
Tree roots hold soil together, reduce erosion
What is agroforestry?
What is agroforestry?
Growing trees amongst crops
How earth dams help manage water in dry areas
How earth dams help manage water in dry areas
Store water in wet season, irrigate crops in dry season
Purpose of magic stones/bunds
Purpose of magic stones/bunds
Hold water on soil, prevent it running off surface
How solar cookers help prevent desertification
How solar cookers help prevent desertification
Use sun's energy to cook, not fuel wood