Soil

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

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

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

The soil shown in time 2 was formed mainly by

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

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?

Which factors most directly control the development of soils?

This soil was formed primarily by