Exam 12: Soils

Explain the importance of the nature of the parent material to soil formation and type. Then, develop two examples in which the influence of parent materials may be outweighed by other soil forming factors.

________ brings soil materials from the A horizon to the B horizon.

In the process of illuviation, water picks up fine soil particles and transports them downward.

Many essential plant nutrients occur in soil solutions as cations.

Much soil material is actually wasted bits of rocks and composed of ________.

An important soil order, the ________ are mainly restricted to the tropics.

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

A soil containing only an A horizon atop partially altered parent material is said to be ________.

Soil water is sometimes added to from the groundwater.

In terms of topography, the deepest soils are ________.

The existence of a B horizon is an indication of a(n) ________ soil.

The laminar sheets which are clay particles are ________.

Describe from the surface downward a "normal" soil profile associated with the climate type of your area and some features of the soil.

In humid regions gray or white soil indicates a concentration of iron near the surface.

In terms of a typical soil-water balance in Most of the United States, which season is associated with a soil water surplus?

The pedogenic regime associated with the tropical moist climates is ________.

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

Eluvial materials are deposited in the soil's ________ horizon.

Gelisols are ________.

A Histosol would most likely be found in ________.