Chapter 12 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 a horizon?

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

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

Which of the following can cause weathering?

• fertilizing the land
• minerals and humus
• water, wind, plants, and animals

What is the largest particle that makes up soil called?

• humus
• erosion
• clay
• sand

What kind of weathering causes the mineral composition of rock to change?

• mechanical weathering
• permeable weathering
• chemical weathering
• general weathering

In the fall, Winston noticed a small crack on a boulder where he played in his backyard. The following spring, he saw that the small crack was much larger than he remembered. What most likely caused the change?

• gravity had caused the rock to shift
• acid rain had caused the crack to erode
• winds had caused the rock to break down
• water had frozen and thawed inside the rocks

What is the relationship between wind erosion and plant cover?

• More plants means less erosion
• More plants means more erosion
• There is no relationship
• Less plant cover means less erosion