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Layers of the Earth Pg. 16 The Earth’s Interior Pg. 17

Layers of the Earth Pg. 16 The Earth’s Interior Pg. 17. Add to Table of Contents:. The Earth’s Interior Pg. 17. The Earth’s Interior can be broken up into 4 major zones: Crust Mantle Outer core Inner core 1 Km= 0.62 Miles. 1. The Crust.

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Layers of the Earth Pg. 16 The Earth’s Interior Pg. 17

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  1. Layers of the Earth Pg. 16The Earth’s Interior Pg. 17 Add to Table of Contents:

  2. The Earth’s Interior Pg. 17 • The Earth’s Interior can be broken up into 4 major zones: • Crust • Mantle • Outer core • Inner core • 1 Km= 0.62 Miles

  3. 1. The Crust • The crust is very thin (average 20 km) & broken-up into plates. • This does not sound very thin but if you were to imagine the Earth as a football, the crust would be about ½millimeter thick. • The thinnest parts are under the oceans and go to a depth of roughly 10 km. It is more dense than under continents. • The thickest parts are the continents which extend down to 35 km on average. The continental crust in the Himalayas is some 75 km thick.

  4. 2. The Mantle • A rocky layer located below the crust with a thickness of 2885 km.

  5. The Mantle (cont…) • The mantle extends about half way to the center. It's made of solid rock and behaves like a thick liquid.

  6. 3. The Outer Core • A layer about 2270 km thick, which is made of liquid iron & nickel. • The movement of this liquid core (and solid core) is responsible for the Earth's magnetic field

  7. The Earth exhibits a magnetic field that reaches above our atmosphere. For a magnetic field to exist, either a permanent magnet must be in the Earth's interior, or ionized molecules are moving in a liquid medium in the Earth's interior. A permanent magnet cannot exist in the Earth's interior due to the high temperatures deep in the Earth. Therefore the magnetic field is thought to be produced by ionized iron moving about in the Earth's core.

  8. 4. The Inner Core • It is made of solid iron and nickel with a radius of about 1216 km. • Temperatures in the core are thought to be 5000-6000°C and it's solid due to the massive pressure.

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