All about soil

Physically breaking down rocks and materials is called__________weathering.

• Chemical
• Mechanical
• Biological
• Permeable

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

A decomposers MAIN function is to:

• 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

Soil conservation includes all of the following EXCEPT_______.

• Desertification
• Contour plowing
• Terracing
• Crop rotation

Topsoil which contains the HUMUS is the soil layer best for growing plants.

• True
• False