Soil

Soil is made of _?_.

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

Soil's one of the Earth’s most valuable resources. Everything on Earth depends on soil somehow.

• True
• False

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

• Physical (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

Layers of soil are also known as _?_.

• Soil Profiles
• Soil Horizons
• Soil sheets
• Soil cores

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Decayed organic material in soil is called _?_.

• Litter
• Silt
• Humus
• Clay

In which horizon of soil profile does leaching normally occur?

• regolith
• subsoil
• topsoil
• bedrock

The layer of soil which the topsoil is found.

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

What is the layer of soil that contains humus, leaf litter, and other organic matter?

• O horizon
• A horizon
• B horizon
• R horizon