Weathering, Erosion, and Soil

What is weathering?

• the process of moving sediment from one place to another
• the breaking down of rocks on Earth's surface
• the remains of decayed plants and animals

What are the smallest particles that make up soil called?

• sand
• bedrock
• clay
• humus

What is humus?

• the bottom layer of soil
• the largest particle that makes up soil
• remains of decayed plants and animals in the soil

The solid rock that forms Earth's surface is called...

• sediment.
• bedrock.
• clay.
• sand.

What is a horizon?

• a layer in the soil
• the breaking down of rock
• the movement of sediment from one place to another

In which horizon would you find weathered rock?

• topsoil
• subsoil
• bedrock
• humus

Sinkholes are caused by...

• rainwater dissolving rock under the ground.
• plants and animals.
• the wind.

If wind, water, or ice move sediment from one place to another, it is called...

• erosion.
• weathering.
• a sinkhole.

Which of the following is NOT be found in topsoil?

• humus
• minerals
• sediment
• bedrock

What happens immediately after rainwater dissolves rock under the ground?

• the opening becomes larger and larger as time passes
• it caves in