Which factors most directly control the development of soils?

The formation of soil is primarily the result of

Which change would cause the topsoil in West Virginia to increase in thickness?

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The soil shown in time 2 was formed mainly by

Which factor has the most influence on the development of soil?

Which substance found in a soil sample collected in an arid region would most likely be absent in a soil sample collected in a humid region?

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The graph supports the conclusion that soils in regions with average annual temperatures above 25°C have

Humus, which is formed by the decay of plant and animal matter, is important for the formation of most

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This soil was formed primarily by

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Which soil horizon contains the greatest amount of material formed by biological activity?

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