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Planet Earth

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Planet Earth Chapter 21 in Textbook Earth s Interior and Plate Tectonics The earth is composed of different geologic layers: Crust, mantle, outer core and inner core. – PowerPoint PPT presentation

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Title: Planet Earth


1
Planet Earth
  • Chapter 21 in Textbook

2
Earths Interior and Plate Tectonics
  • The earth is composed of different geologic
    layers
  • Crust, mantle, outer core and inner core.
  • Generally the earth gets warmer as you go deeper.
  • In addition to high density, radioactive elements
    contribute to the high heat of the interior of
    the earth.

3
What is the earths interior like?
  • Crust-the thin and solid outermost layer of the
    earth above the mantle.
  • Mantle-the layer of rock that is between the
    crust and the core, and makes up roughly 80 of
    the earths volume.

4
The core
  • Contains both inner and outer core.
  • Outer core is liquid metal.
  • Inner core is solid and temperatures exceed 6000
    degrees Celsius.
  • Impossible to get there-you would melt.

5
Plate tectonics
  • Alfred Wegner noticed that the coastlines of
    Africa and South America could have fit together
    as part of what he called, Pangea.
  • Evidence included fossils, alignment of oceanic
    rocks, and the fact that the earth has plates
    that move over the mantle.
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