$(a)$ What causes wind?
$(b)$ List any two methods of preventing soil erosion.
$(b)$ List any two methods of preventing soil erosion.
(N/A) Wind is caused by the movement of air from one region to another due to the uneven heating of the Earth's atmosphere by the Sun.
$(b)$ Two methods of preventing soil erosion are:
$1.$ Afforestation (planting more trees).
$2.$ Terrace farming (or contour ploughing).
$(b)$ Two methods of preventing soil erosion are:
$1.$ Afforestation (planting more trees).
$2.$ Terrace farming (or contour ploughing).
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