Soils & Weathering

Soil formation begins with the weathering of_______.

• Humus
• 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

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

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

• True
• False

Which horizon is made up of partially weathered rocks?

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

There is an unlimited supply of fertile soil.

• True
• False

In which answer choice are the soil particles arranged in order from LARGEST to SMALLEST?

• Silt, sand, clay
• Silt, clay, sand
• Clay, silt, sand
• Sand, silt, clay

Decayed organic matter is...

• Hummus
• Humus
• Himalayas
• Hummers