Desertification occurs<span> due to a decrease in vegetation. This can </span>happen<span> naturally due to a drought or can be caused by human activities. The lack of plants can cause changes to the land. Plants help shade the soil, so when plants are removed, the soil will be exposed to the sun and will dry out more quickly. So, I would say C. An area of forest is clear cut.
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El Salvador was the easiest way to get through north America instead of going all the way around towards the arctic oceans.
Many things caused the crash. Taxes were too high, bad bank practices caused a recession, and too many workers went on strike (there were many other causes but thats all o could think of)