Soil

Soil that is rich in humus has high

• fertility.
• water content.
• sand content.
• clay content.

Soil formation begins with the weathering of_______.

• Humas
• Subsoil
• Litter
• Rock

The breakdown of rock into smaller pieces by physical means; common causes are ice, wind, water, gravity, plants, and animals

• Mechanical Weathering 
• Chemical Weathering

The process by which rocks break down as a result of chemical reactions/ common causes are water, weak acids, and air

• Mechanical Weathering 
• Chemical Weathering

Soil is made of

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

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Which of the following is NOT one of the three layers of soil?

• topsoil
• undersoil
• subsoil
• bedrock

Are there minerals in soil?

• Yes
• No

When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?

• sand
• silt
• clay
• humus

What is the layer of soil just below the topsoil?

• soil
• subsoil
• topsoil
• terrace farming