Soil Conservation

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Soil is made of

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

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

• topsoil
• undersoil
• subsoil
• bedrock

What is the process of rocks being broken down over time called?

• Weathering
• Accumulation
• Condensation
• Evaporation

Layers of soil are also known as:

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

Movement of soil and rocks from one place to another is called...

• weathering 
• humus
• erosion

Why is topsoil darker than all other levels of soil?

• It contains all the darker colored minerals
• It contains volcanic rock
• It contains more organic matter
• It contains bits of burned trees

The texture of soil depends mainly on

• the types of plants that grow in the soil.
• the size of the particles in the soil.
• the color of the soil.
• the number of worms in the soil.

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

• O - Organic
• A - Topsoil
• B - Subsoil
• R - Bedrock

Organic matter is made of materials that….

• Were once living
• Were once nonliving
• Were once living and nonliving