1. A tree root breaking a rock into smaller fragments is an example of both ___ and mechanical weathering.
2. When rocks are exposed to heat, they _, which can contribute to thermal stress.
3. When harmful gases, such as sulfur dioxide and nitrogen oxide, react with water in the atmosphere, they can produce
4. The agent of erosion involved in stream erosion is
5. When the ground is so saturated that it can't absorb rainfall or when rain falls so quickly that the ground can't absorb the water, _ forms.
6. A/An _ is a huge, heavy, moving body of ice that picks up rocks and sand and erodes the ground beneath it as these materials scrape across it.
7. Hot arid climates are prone to erosion by _.
8. Rows of trees and shrubs planted to protect fields from wind erosion are known as ___.

1. A tree root breaking a rock into smaller fragments is an example of both chemical and mechanical weathering. Weathering is the breakdown of rock into smaller particles.

2. The rocks when are exposed to heat, expand contributing to thermal stress.

3. Sulfur dioxide and nitrogen oxide are harmful gases, which react with water in the air to form acid rain.

4. The agent of erosion involved in stream erosion is referred to as rushing water.

5. The ground is so saturated that it can't absorb rainfall or heavy and quick rainfall does not allow the ground to absorb the water forming runoffs.

6. Glacier is a huge, heavy, moving body of ice that picks up rocks and sand and erodes the ground beneath it as these materials scrape across it.

7. Hot arid climates are prone to erosion by wind.

8. Windbreaks refer to the rows of trees and shrubs planted to protect fields from wind erosion.

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