Geological Processes: How Mountains and Valleys Form

What is the main idea of the passage "Geological Processes: How Mountains and Valleys Form"?

• How rivers and glaciers are important to the Earth.

• The different types of scientists who study the Earth.

• The natural processes that create mountains and valleys.

• The importance of protecting the environment.

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Main idea

Why did the author write the passage?

• To persuade people to visit mountains and valleys.

• To inform readers about how mountains and valleys are formed.

• To entertain with stories about mountains and valleys.

• To describe different types of plants and animals in mountains and valleys.

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Author's purpose

Based on the passage, what can be inferred about the relationship between rivers and valleys?

• Rivers destroy valleys over time.

• Rivers are the only way valleys can form.

• Rivers help form valleys by eroding the land.

• Rivers and valleys do not affect each other.

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Interaction of ideas

What does the term 'erosion' mean as used in the passage?

• The process of land rising to form mountains.

• The movement of tectonic plates.

• The wearing away of land by water, ice, or wind.

• The act of protecting the environment.

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Vocabulary