GG101 - Ch 7

Spheroidal weathering is caused by:

Chemical weathering of angular rocks.

Karst topography is the result of:

Chemical weathering of carbonate rock.

Weathering consists of:

Chemical, biological, and physical degradation.

The variables that most affect the weathering process are rock composition and _____________.

Climate

The uplift weathering hypothesis:

Explains global cooling.

A dark-colored layer of mixed mineral and organic matter defines the ______________ soil horizon.

A

The tendency of silicates to weather on Earth's surface is predicted by:

Goldich Stability Series.

Aluminum ore comes from:

Humid tropical settings.

___________causes causes feldspar to break down and produce clay.

Hydrolysis

The most important form of chemical weathering of silicate minerals is:

Hydrolysis.

Iron oxide and aluminum oxide soils are:

Insoluble residues.

Which of the following statements about soil erosion is true?

It is a form of pollution that affects biological communities. It is a major problem affecting millions of acres of crop lands. It threatens to impact food production. It takes centuries to make soil and only minutes to erode it.

Which of the following statements about carbon dioxide is true?

It is an important gas that regulates Earth's climate and influences groundwater chemistry. The amount present in the atmosphere is affected by the rate of crustal weathering. Its decrease has caused net global cooling over recent geologic history. It is a greenhouse gas.

Insoluble Residues are:

Minerals produced by weathering.

The major agricultural lands in the United States are based on which soil?

Mollisols

The chemical interaction of oxygen with other substances is known as:

Oxidation.

Soil profiles in temperate climates are characterized by

a rich humus layer.