Exam 12: Soils

The cation exchange capacity is most closely associated with ________.

Like ________, humus is a catalyst for chemical reactions and a reservoir for plant nutrients and soil water.

On soils of the ________ soil order, the litter decomposes slowly and the upper part of the soil is so leached that it is light in color.

Mollisols are relatively rare soils in the United States.

In the United States, the ________ states are most closely associated with gleization.

The difference between field capacity and the wilting point is called ________.

This type of water is held to soil particles by adhesion and is normally unavailable to plants.

Gravitational water is ________.

Because of its comprehensiveness, the Soil Taxonomy presents great difficulty for small scale maps.

An acid is a chemical compound that produces hydronium ions or ________ ions when dissolved in water.

Hardpan is a calcium carbonate concentration in the B horizon.

Histosols are a soil order most common in world deserts.

Which pedogenic regime is most closely associated with the drier prairies of North America?

In semiarid climates, grass roots transport much ________ from the B horizon to the A horizon.

Which of the following is a reason earthworms increase the fertility of the soils in which they reside?

The processes of eluviation and leaching are closely connected.

________ are organisms that create organically rich casts.

A soil with a large percentage of clay would be ________ and ________.

A major determinant of a soil's water holding capacity is its ________.

Which soil type is associated with an alternating wet and dry climate?