It doesn't break down easily and it can cause a problem for the environment or wild life, by preventing things from growing or killing animals.
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The correct answer is B. Less arable land.
Arable land is the main reason why the land is cleared. Arable land is the land that is suitable for ploughing and of sufficient quality for growing plants. So for this reason, the forests are cleared (by cutting the trees and bushes) and more land for agriculture is gained.
Changes in pressure cause wind to blow.
Answer:
I'm pretty sure its B, but if I got that wrong I'm so sorry.