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Frage		Antworten
a mixture of sand, silt, soil, clay, rock and humus (plant and animal remains) Lernen beginnen		soil
when forces on Earth breaks rocks apart or wear rock away Lernen beginnen		weathering
the uppermost 5 to 20 cm of soil with a high concentration of organic matter and microorganisms where almost all of the biological activity in soil takes place Lernen beginnen		topsoil
easily broken down by biological activity, especially bacteria in the soil Lernen beginnen		biodegradable
to break down into smaller, more basic parts Lernen beginnen		decompose

Formation of Soil 12/4/15