Earth's Structure

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What are the Appalachian Mountains?

Back

The Appalachian Mountains are a mountain range that formed about 480 million years ago and have been shaped by weathering and erosion over millions of years.

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What is the hydrosphere?

Back

The hydrosphere refers to all the water on Earth, including oceans, rivers, lakes, and water vapor in the atmosphere.

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What percentage of Earth's water is fresh water?

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Only 3% of Earth's water is considered fresh water.

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What is the atmosphere?

Back

The atmosphere is the layer of gases surrounding Earth, essential for life as it provides air to breathe and protects from harmful solar radiation.

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What is the biosphere?

Back

The biosphere is the part of Earth where living things exist, including land, water, and the atmosphere.

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What is the lithosphere?

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The lithosphere is the rigid outer layer of Earth, consisting of the crust and the upper mantle.

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What is erosion?

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Erosion is the process by which soil and rock are removed from the Earth's surface by natural processes such as wind or water flow.

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What is weathering?

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Weathering is the breaking down of rocks and minerals into smaller pieces by physical, chemical, or biological processes.

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What is the water cycle?

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The water cycle is the continuous movement of water on, above, and below the surface of the Earth, including processes like evaporation, condensation, and precipitation.

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What is a watershed?

Back

A watershed is an area of land that drains all the streams and rainfall to a common outlet, such as a river or lake.