Unit 9: Soil

What is the breakdown of the Earth’s crust into sediment called? (DOK 1)

• erosion

• deposition

• weathering

• whooshing

What is it called when weathered rock is carried away? (DOK 1)

• weathering

• erosion

• deposition

• breaking

Flood water pounding against a canyon wall and wearing it down (DOK1)

• Weathering

• Erosion

• Deposition

Answer explanation

Weathering is the breaking down of rocks on Earth's surface into smaller pieces.

Which one of the examples below is physical weathering? (DOK 1)

• lichens growing on rock

• acid rain wearing away limestone

• oxidation (rusting) of a flag pole

• frost wedging splitting a rock apart

The water in a fast moving river causes rocks to bump and scrape against one another. What will happen to these rocks over time? (DOK 2)

• They will get larger

• They will get smaller

• They will get sharper

• They will get heavier

The movement of water can cause erosion. What is an example of water erosion? (DOK 2)

Explain the difference between weathering and erosion. (DOK 3)

Ice and water are two agents that can be involved in the process of weathering. Explain how freezing and thawing can cause weathering. (DOK 3)

Propose a plan for stopping weathering on a beloved statue. (DOK 4)

What is humus?

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