Unit 3 and 4 Soil Chemistry Exam

How many basic soil textural classes are there?

• 5
• 12
• 7
• 9

All of the following are soil parent material except:

• Igneous Rock
• Metamorphic Rock
• Sedimentary Rock
• Ignitic Rock

Which of the following is 2.0mm- 0.05mm in diameter?

• Sand
• Silt
• Clay
• Gravel

Which of the following is less than 0.002mm in diameter?

• Sand
• Silt
• Clay
• Gravel

Which of the following is 0.05mm- 0.002mm in diameter?

• Sand
• Silt
• Clay
• Gravel

True or False: There are two ways to determine soil textural classes

• True
• False

True or False: Time is a component in soil formation.

• True
• False

True or False: Aggregates help give soil its structure.

• True
• False

Thin layer of soil that is composed of decaying organic matter is called what?

• The C Horizon.
• The O Horizon.
• The A Horizon.
• The B Horizon.

The layer of soil labeled R is made of what material?

• Decaying organic material.
• Some organic material and broken rock.
• Rich nutrient dense clay.
• Unweathered rock known as Bedrock.