Soil 3.6

Identify the term that describes decaying material found in soil.

• Humus

• Clay

• Silt

• Weathering

The layer of soil just under the topsoil is called _______.

• humus
• clay
• subsoil
• rock

Under the subsoil layer is a layer of rock called _______.

• bedrock
• soil
• topsoil
• loam

Which of the following is not a type of soil?

• minerals

• clay

• topsoil

• sand

Weathering is......

• rocks, grass, and mud.

• the breakdown of rocks into smaller pieces

• the breakdown of wind, rain, and friction

• the weather outside

What soil is best for growing plants?

• clay

• sand

• mud

• topsoil

This type of soil is sticky when wet and hard when dry. 

• clay
• silt
• sand
• gravel

This type of soil is made of tiny pieces of rock. 

• sand
• clay
• humus
• loam

It is important for soil to retain water to 

• withstand weathering
• erode more slowly
• help plants to grow
• keep it from being dry

True or False: Soil takes very little time to form.

• True

• False