Soil Test

Which of the following is NOT a part of soil?

• humus
• trash
• sand
• silt

Which layer of soil contains decaying plants and animals?

• subsoil
• silt bedrock
• topsoil
• silt

All of the following help break down larger rocks into smaller pieces in the process of weathering EXCEPT:

• earthquake
• wind
• lava
• weather

________________ occurs when rocks are breaking down due to weather, wind, and earthquakes.

• weathering
• humus
• sand 
• erosion

Which soil is best for planting crops?

• sand
• silt
• clay
• trash

_____is very rich in nutrients because it is composed of plants and animals that die and break down.

• humus
• bedrock
• topsoil
• subsoil

The solid rock beneath all soil is called_____________________.

• humus
• bedrock
• topsoil
• subsoil

The layer of soil that is high in nutrients and best for plant growth is the ________________ layer.

• humus
• bedrock
• topsoil
• subsoil

The layer directly beneath the topsoil that is made up of mostly clay and has few nutrients for plants is called _________________.

• humus
• bedrock
• topsoil
• subsoil

__________________is made up of tiny fragments of rock, does not hold water well, and has very few nutrients.

• sand
• clay
• silt
• weathering