Ch 05.2: Soil

Which of the following is NOT a major component of soil?

• mineral matter

• humus

• air

• earthworms

The factor that has the greatest effect on soil formation is ___.

• climate

• parent material

• time

• slope orientation

A soil’s texture is determined by ___.

• mineral composition

• type of humus

• water content

• particle size

The main source of organic matter in soil is ___.

• water

• bacteria

• fungi

• plants

In which of the following areas will soil formation be greatest?

• a steep slope in a warm, wet climate

• a flat area in a cold, wet climate

• a flat area in a warm, wet climate

• a north-facing area on a steep slope

Use Figure 5-1 to determine what a soil is called if it has 20 percent clay, 60 percent silt, and 20 percent sand.

• sandy clay loam

• loam

• silty loam

• loamy sand

What are the proportions of clay, silt, and sand shown at point C in Figure 5-1?

• clay: 10 percent; silt: 80 percent; sand: 10 percent

• clay: 10 percent; silt: 20 percent; sand: 70 percent

• clay: 20 percent; silt: 60 percent; sand: 20 percent

• clay: 30 percent; silt: 40 percent; sand: 30 percent

What are the proportions of clay, silt, and sand shown at point B in Figure 5-1?

• clay: 40 percent; silt: 30 percent; sand: 30 percent

• clay: 60 percent; silt: 20 percent; sand: 20 percent

• clay: 10 percent; silt: 80 percent; sand: 10 percent

• clay: 20 percent; silt: 40 percent; sand: 40 percent

Tags

NGSS.MS-LS1-5

What are the proportions of clay, silt, and sand shown at point A in Figure 5-1?

• clay: 60 percent; silt: 20 percent; sand: 20 percent

• clay: 40 percent; silt: 40 percent; sand: 20 percent

• clay: 80 percent; silt: 10 percent; sand: 10 percent

• clay: 70 percent; silt: 20 percent; sand: 10 percent

In a well-developed soil profile, which horizon is the uppermost layer?

• the C horizon

• the B horizon

• the A horizon

• the parent horizon