Layers of Earth Flashcards

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Questions and Answers

What is the center of the Earth called?

  • Outer Core
  • Inner Core (correct)
  • Mesosphere
  • Crust

What is the state of matter of the Outer Core?

molten

The middle portion of the mantle is known as the ______.

Asthenosphere

The Mesosphere is the upper portion of the mantle.

<p>False (B)</p> Signup and view all the answers

Which layer surrounds the Inner Core?

<p>Outer Core (B)</p> Signup and view all the answers

What is the thickness range of the Upper Mantle?

<p>200-300 km</p> Signup and view all the answers

What is the outermost layer of Earth called?

<p>Crust (C)</p> Signup and view all the answers

The Lithosphere consists of the upper mantle and the ______.

<p>Crust</p> Signup and view all the answers

Flashcards

What is the Earth's Inner Core?

The solid, extremely hot, and dense center of the Earth, mostly composed of iron and nickel.

What is the Earth's Outer Core?

The liquid layer surrounding the Inner Core, primarily made of iron and nickel.

What is the Earth's Mantle?

The semi-solid, mostly rock layer beneath the Earth's crust, responsible for tectonic plate movement.

What is the Asthenosphere?

The middle portion of the mantle, characterized by its semi-liquid state and ability to flow.

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What is the Earth's Crust?

The outermost layer of the Earth, relatively thin and composed of rock.

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What is the Earth's Lithosphere?

The combination of the Earth's crust and the uppermost part of the mantle, acting as one rigid layer.

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What is the Mesosphere?

The upper portion of the mantle, with a rigid structure due to higher pressure.

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True or False: The Mesosphere is the upper portion of the mantle.

False. The upper portion of the mantle is called the Mesosphere. The Asthenosphere exists in the middle of the mantle.

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Study Notes

Inner Core

  • Center of the Earth with a thickness of 1280 km.
  • Composed primarily of iron and nickel.
  • Maintains a solid state despite extreme temperature range of 6000-7000°C.

Outer Core

  • Surrounds the inner core with a thickness of 2250 km.
  • Composed of molten iron and nickel.
  • Temperature ranges from 4000-5000°C.

Mesosphere

  • The lower portion of the mantle with a thickness of 2000-2200 km.
  • Composed of solid rock.
  • Temperatures in this layer range from 3200-4000°C.

Asthenosphere

  • Positioned in the middle of the mantle with a thickness of 400-600 km.
  • Contains molten rock.
  • Temperature range is between 3000-3200°C.

Upper Mantle

  • The upper portion of the mantle, measuring 200-300 km in thickness.
  • Consists of solid rock.
  • Temperature varies from 2800-3000°C.

Crust

  • The outermost layer of the Earth with a variable thickness of 5-70 km.
  • Primarily composed of solid rock.
  • Temperature is variable depending on location.

Lithosphere

  • Comprises the upper mantle and crust, with a total thickness of 250-300 km.
  • Made up of solid rock.

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