Oxisol

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What Wikipedia says

Oxisols are a soil order in USDA soil taxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator. In the World Reference Base for Soil Resources (WRB), they belong mainly to the ferralsols, but some are plinthosols or nitisols.

Excerpt from the Wikipedia article “Oxisol”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: http://soils.usda.gov/technical/soil_orders/ - http://www.usda.gov/wps/portal/!ut/p/_s.7_0_A/7_0_1OB?navtype=FT&navid=PRIVACY_POLICY, Public domain, via Wikimedia Commons.