When a tropical rain forest is cleared why does the soil usually become useless for growing crops after only a few years?
There are a couple of reasons, but the main reason is that soils in rainforests are typically low in minerals and nutrients to begin with.
Rainforest soil is typically poor in nutrients and minerals because they are stored in the plants. When plants die, they decay very quickly and their nutrients are picked up again by the living vegetation. Nutrient cycling occurs rapidly in rainforests, leading to poor soils.
Removing the rainforest also leads to soil erosion. When it rains, the roots of vegetation are no longer present to hold together the soil. The result is more soil is washed off into rivers, streams, and so forth. Thus, whatever limited nutrients remained in the soil may quickly wash away due to runoff.
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Clearing tropical rainforests exposes the soil to sunlight and rainfall, leading to rapid nutrient leaching. The nutrient cycle is disrupted, and the topsoil becomes nutrient-poor, hindering crop growth.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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