What makes the soil in tropical rainforests so rich?

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What happens to tropical soils when the rainforest is cleared? - Quora

Tropical rainforest Definition, Characteristics, Location

Tropical Stream Ecology Ecology, Academic press, Ebooks

Abundant rainforests, useless soils – DW – 08/23/2019

The Rainforest: tropical forest facts, photos, and information

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Paradox explained Smithsonian Tropical Research Institute

Rainforest - Wikiwand

What makes a tropical rainforest difficult to penetrate and