[Date 4/30] Soil Assessment

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

What is the common name for Horizon A?

• bedrock
• topsoil
• parent material
• subsoil

What is humus?

• organic material rich in nutrients
• subsoil
• parent material
• trees

Subsoil is made mostly of

• parent material
• humus
• clay and silt
• bedrock

What process breaks down bedrock to begin soil formation?

• leaching
• weathering
• decomposition
• humus

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

• sand
• clay
• humus
• loam

Which of the following types of soil has the largest particles?

• sand
• silt
• humus
• clay

Which type of soil is best for growing plants?

• sand
• clay
• gravel
• humus

How do the nutrients necessary for plant growth get into the soil?

• The soil absorbs sunlight.

• Water filters through the soil.

• organic matter is decayed in the soil.

• The soil is exposed to the air.

Soil that drains slowly most likely has a high amount of

• ash

• sand

• clay

• peat