Exam Review

Soil supplies anchorage, water, oxygen, and nutrients to plants.

• true

• false

Oxygen, carbon, and ____ are gases exchanged in soil.

• helium

• lithium

• nitrogen

• calcium

Hardpans, water-logged soil, and ____ prevent roots from growing deeply.

• micropores

• bedrock

• minerals

• mulch

Is soil composition that is about 30% pore space and 70% solid material considered good?

• yes

• no

Answer explanation

about 50% pore space and 50% solid material is good

Physical weathering is the disintegration of rock by only temperature, water, and wind.

• true

• false

Answer explanation

and other factors like frost wedging and salts crystallizing in cracks

Rock formed by pressure applied to lose materials is called ____.

• metamorphic

• sedimentary

• igneous

The four soil-forming processes includes all of the following EXCEPT ____.

• loss

• translocation

• addition

• transformation

• transpiration

Answer explanation

transpiration is water loss to through evaporation

In capability classes, Class I soils have the fewest limitations and Class VIII soils are nearly unusable for agriculture.

• true

• false

Soil maps do not include enough information to make good land-use decisions.

• true

• false

There are ____ soil capability classes.

• 6

• 7

• 8

• 9