Soil Basics

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

• topsoil
• undersoil
• subsoil
• bedrock

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

• clay
• sand
• silt
• mud

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

When there are not enough plants to hold topsoil in place, water and  _______ carry the topsoil away, leaving the subsoil exposed

• sunlight
• birds
• magnetic fields
• wind

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

Layers of soil are also known as:

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

This term indicates the relative content of particles of various sizes, such as sand, silt and clay in the soil.

• texture

• type

• pH

• nutrient content

What are the main components of soil?

• Water

• Air

• Bedrock

• Minerals

• Organic Matter

The soil triangle is used to determine the soil texture and percentages of sand, silt and clay.

• True

• False