Sustainable: Soil Profile Review

The top layer of the earth's crust is known as:

• Soil

• Magma

• Humus

• Sand

Soil is important for all of these reasons, EXCEPT:

• Cools the earth

• Filters rainwater

• Is a growing medium for plants

• Provides biodiversity

• Is a habitat for various organisms.

The layers of the soil are called:

• Cake

• substrates

• soil profile

• soil moisture

What is a characteristic of the A horizon?

• Mostly solid rock

• Has few plant nutrients

• Never has organic matter

• Is where you find most plant roots

The O horizon of a soil profile is made up of mostly:

• water

• organic material

• bedrock

• none of these

A "perfect" soil would be made up of ____percent solid material (minerals)

• 10

• 15

• 40

• 50

A "perfect" soil is 50% pore space--AKA, not solid material. In this pore space, half of it should be air and the other half should be _____

• Water

• organic material

• minerals

• mayonnaise