Soil in the tropical rainforests is very nutrient poor. The topsoil is only one to two inches deep. Plant life is so lush is because the plants store the nutrients in themselves rather than the soil. The soils are so infertile is because they are more than 100 million years old, and have taken a beating from the elements. Rain washes minerals out of the soil, leaving them more acidic and nutrient poor. Soil exposed to the heat and condensed sunlight turns soil into red clay.
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