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12 questions from this quiz
Land becoming drier and less productive
One third
The Sahel in Africa
Reduces rainfall in already dry areas
More water evaporates from land & plants
Cattle eat plants faster than regrowth
All soil nutrients get used up
Evaporation draws salts to surface
Tree roots hold soil together
Store water in wet season for dry use
Different crops use different nutrients
To hold water on soil surface
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