Soil Composition

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 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

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

The movement of rocks and weathered materials is called_________.

• Chemistry
• Physical
• Weathering
• Erosion

Which horizon is made up of partially weathered rocks?

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

In which horizon is most of the HUMUS?

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

Which horizon contains clay, silt, minerals, and a little humus?

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

In which horizon is the Bedrock

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

Which of the following is NOT a component of soil?

• Mineral particles

• Air

• Water

• Each choice is a component of soil