Physically breaking down rocks and materials is called__________weathering.

• Chemical
• Mechanical
• Biological
• Permeable

A rock containing iron is soft, crumbly, reddish in color. It's been chemically weathered by__.

• Carbon Dioxide
• Oxygen
• Nitrogen
• Sulfer

Soil formation begins with the weathering of_______.

• Humas
• Subsoil
• Litter
• Rock

The layer of soil which the topsoil is found.

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

The MAIN  thing Decomposers do for the the soil is the following:

• Store moisture
• Burrow deep in the soil
• Make space for air and water
• Break down and digest dead organisms

The MAIN  thing Decomposers do for the the soil is the following:

• Store moisture
• Burrow deep in the soil
• Make space for air and water
• Break down and digest dead organisms

What effect did over plowing and cutting down trees in the Great Plains during the 1930’s?

• It had little effect
• It increased soil fertility
• It was a primary cause of the Dust Bowl
• Farmers had a great harvest

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

The two main factors that determine the rate of weathering are the TYPE of rock and_____.

• Music
• Climate
• Size of rock
• Weight of rock

The movement of rocks and weathered materials is called_________.

• Chemistry
• Physical
• Weathering
• Erosion