Midterm Review 2019

The decayed organic matter in soil is called _?_ that is contained in horizon _?_.

• worms, A

• litter, O

• humus, A

• leaching, B

Which of the following is NOT a form of mechanical erosion?

• ice wedging

• animal burrowing

• plant acids

• surface area

What type of rock is suitable for cave formation

• sandstone

• limestone

• basalt

• granite

Materials exposed to oxygen and water; a form of chemical weathering

• pH

• oxidation

• loam

• ice wedging

Identify the A horizon and the R horizon.

• A = Organic R = Bedrock

• A = Topsoil R = Organic

• A = Topsoil R = Bedrock

• A = Subsoil R = Organic

This horizon has plant root ends with less humus; & this horizon contains litter.

• C, O

• B, O

• B, A

• C, A

Which is not a factor that affects the formation of soil?

• The moon

• Slope of the land

• Vegetation

• Amount of Rainfall

Causes of soil erosion include

• Wind

• Water

• Removal of Vegetation

• All of these

Oxidation requires a combination of three things ?

• iron, oxygen, and water

• iron, carbon dioxide, and water

• rock, oxygen, and water

• acid, iron, and oxygen

Materials move down from one soil layer to another through a process called _?_.

• ice wedging

• humus

• leaching

• terracing