In lab,you collect and analyze several soil samples,and find that there is a certain amount of spongy,hard-to-digest carbon complex,mostly within the topsoil.This is

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The spongy, hard-to-digest carbon complex found mostly within the topsoil is humus. Humus is composed of decomposed organic matter that is difficult to break down and provides nutrients to plants. Clay and silt are soil texture types, creosote is a chemical found in some soils, and topsoil is the upper layer of soil that contains organic matter and nutrients.

In Lab,you Collect and Analyze Several Soil Samples,and Find That