Soil Formation/Soil Erosion

What is weathering?

• the process that breaks down rock and other substances at Earth’s surface

• the process that breaks down magma beneath Earth's surface

• the process that creates wind

• the process that creates hurricanes and tornadoes.

Select the two types of weathering.

• Chemical

• Mechanical

• Potential

• Kinetic

• Electric

Select the types of mechanical weathering.

• Freezing and thawing

• Release of pressure

• Abrasion

• Growth of plants

• Actions of animals

Select the five types of chemical weathering.

• Water

• Oxygen

• Carbon Dioxide

• Acid Rain

• Living Organisms

What is soil?

• loose, weathered, material on Earth’s surface in which plants can grow

• Layers A, B, C, and Bedrock

• a dark-colored substance formed from plant and animal decay

• process of decomposition

What are the four layers of soil horizons?

• loose, weathered, material on Earth’s surface in which plants can grow

• Layers A, B, C, and Bedrock

• a dark-colored substance formed from plant and animal decay

• process of decomposition

What is humus?

• loose, weathered, material on Earth’s surface in which plants can grow

• Layers A, B, C, and Bedrock

• a dark-colored substance formed from plant and animal decay

• process of decomposition

How is humus formed?

• loose, weathered, material on Earth’s surface in which plants can grow

• Layers A, B, C, and Bedrock

• a dark-colored substance formed from plant and animal decay

• process of decomposition

Worms

• digest plant remains

• attack dead organisms and their wastes in soil

• break up compacted soil and mix humus throughout it

• eat soil, mixing and digesting subsoil and humus

Fungi

• digest plant remains

• attack dead organisms and their wastes in soil

• break up compacted soil and mix humus throughout it

• eat soil, mixing and digesting subsoil and humus