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12 questions from this quiz
Rainfall washing away topsoil & nutrients
Between 10 and 25 metres apart
Less than 2%
Materials are freely available locally
November to May
20-40 cm diameter, 10-20 cm deep
12,000 to 25,000
They break down organic matter into humus
Ploughing across slopes along contours
Channels allow rapid water flow downslope
The terrain is mainly flat
Slowing water to let it soak in
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