USGS CMG InfoBank: Soils

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Comment: 15:09 - 15:35 (00:26)
Source: Annenberg/CPB Resources - Earth Revealed - 15. Weathering and Soils
Keywords: weathering, "mechanical weathering", "chemical weathering", soil, plant, humus, rock

Our transcription: Soils are formed as a result of the mechanical and chemical breakdown of rock.
They are enriched by the decomposition of plant life which produces the rich organic matter known as "humus."
It's this combination of weathered fragments of rock and humus that creates the most fertile soils.

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