what is composition of level C in a soil profile? A. Topsoil mixed with inorganic material B. Clay and silt mixed with sand C. Decayed organic material D. Weathered rock fragments
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Below the A and B horizons is the C horizon, a zone of little or no humus accumulation or soil structure development. The C horizon often is composed of unconsolidated parent material from which the A and B horizons have formed. It lacks the characteristic features of the A and B horizons and may be either relatively unweathered or deeply weathered. At some depth below the A, B, and C horizons lies consolidated rock, which makes up the R horizon.
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just took the test: answer is D-weathered rock fragments
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