Unit 5: Soil Layers, Weathering, Erosion, and Sedimentary Rocks

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Soil is formed slowly through the weathering of materials called ___.

• Bedrock or parent material
• Magma and lava
• organic matter
• leaves and litter

What are the two types of weathering?

• Rain and Snow
• Precipitation and Temperature
• Physical and Chemical
• Metal and Nonmetal

Large rocks fall from mountainsides

• Chemical weathering
• Mechanical weathering

Especially in deserts,  rocks heat up in the day and, as the temperature drops greatly at night, the rocks can flake easily (exfoliate).

• hydraulic action
• gravity
• freeze/thaw
• hydration

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

The movement of rocks and weathered materials is called_________.

• Chemistry
• Physical
• Weathering
• Erosion

The process by which water, ice, wind or gravity moves weathered rock and soil from one place to another.

• weathering
• erosion
• deposition
• dumptruck

This type of weathering occurs when rock is physically broken down into smaller pieces of rock.

• mechanical weathering
• chemical weathering
• erosion weathering
• deposition

This type of weathering occurs when rocks weaken then break down due to chemical changes in the composition of the rock.

• mechanical weathering
• chemical weathering
• erosion weathering
• deposition