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Earth Science - Earth's Structure

Earth's Structure

Cross section of the Earth's crust

Earth's Structure

Under the crust is a layer called the lithosphere. The lithosphere is made up of giant, puzzle-like pieces of rock called tectonic plates.

Cross section of the Earth's crust

Earth's Structure

The lithosphere floats on a layer of hot magma called the asthenosphere. The asthenosphere has a convection current, made by magma swirling around in a circular motion, from top to bottom. The convection current is what makes the plates move.

Cross section of the Earth's crust

Earth's Structure

The asthenosphere is part of a gigantic layer that takes up a full 2/3 of the Earth's radius: the mantle.

Cross section of the Earth's crust

Interpret Information

Which of the following is true?

  • The asthenosphere is the same as the mantle
  • The asthenosphere is part of the mantle
  • The asthenosphere is not part of the mantle

Interpret Information

Which of the following is true?

  • The asthenosphere is the same as the mantle
  • The asthenosphere is part of the mantle
  • The asthenosphere is not part of the mantle

Cross section of the Earth's crust

Earth's Structure

The upper mantle is made of magma and hot silicon, iron, magnesium, and oxygen.

The lower mantle is made of the same materials as the upper mantle, but it is solid rock.

The mantle extends to 2,900km below the surface of the earth.

Cross section of the Earth's crust

Interpret Information

Which of the following is true?

  • The upper and lower mantles are exactly the same
  • The upper and lower mantles are completely different
  • The upper and lower mantles are made up of different materials
  • The upper and lower mantles are made up of the same materials

Interpret Information

Which of the following is true?

  • The upper and lower mantles are exactly the same
  • The upper and lower mantles are completely different
  • The upper and lower mantles are made up of different materials
  • The upper and lower mantles are made up of the same materials

Remember we saw that the upper mantle is made up of magma and hot silicon, iron, magnesium, and oxygen.

The lower mantle is made of the same materials as the upper mantle, but it is solid rock.

Earth's Structure

The Earth's core is divided into two parts: inner and outer.

The outer core is Earth's only entirely liquid layer. It is made up of molten iron and nickel and is 2,200km thick. That surrounds the earth.

Cross section of the Earth's crust

Earth's Structure

The inner core can be found 5,100km below the surface. It is a hard ball of extremely hot iron. The inner core was created by the pressure of all the outer layers pushing in on it.

Cross section of the Earth's crust

Apply Information

From the diagram of earth;s structure you can tell:

  1. Every planet has a crust
  2. Every planet has a core
  3. Earth's inner core is solid
  4. All of the above

Cross section of the Earth's crust

Apply Information

From the diagram of earth;s structure you can tell:

  1. Every planet has a crust
  2. Every planet has a core
  3. Earth's inner core is solid
    Since the diagram only shows Earth, we can only determine information about Earth -- not other planets.
  4. All of the above

Cross section of the Earth's crust