Soil

What is the process of rocks being broken down over time called?

• Weathering
• Accumulation
• Condensation
• Evaporation

Layers of soil are also known as:

• Soil Profiles
• Soil Horizons
• Soil sheets
• Soil cores

Movement of soil and rocks from one place to another is called...

• weathering 
• humus
• erosion

What is the layer of soil that contains humus, leaf litter, and other organic matter?

• O - Organic
• A - Topsoil
• B - Subsoil
• R - Bedrock

Why is topsoil darker than all other levels of soil?

• It contains all the darker colored minerals
• It contains volcanic rock
• It contains more organic matter
• It contains bits of burned trees

Which horizon is made up of partially weathered rocks?

• Horizon A

• Horizon B

• Horizon C

• Horizon D or R (Bedrock Layer)

SOIL LAYERS ARE CALLED.......

• MATERIALS
• ORGANIC
• HUMUS
• HORIZONS

There is an unlimited supply of fertile soil.

• True
• False

This term describes decayed organic matter such as dead plants and animals

• topsoil

• subsoil

• humus

• soil

Which horizon is also called "topsoil"?

• Horizon O

• Horizon A

• Horizon B

• Horizon C