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Earth

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Earth Models Model is a representation of an object or event. Shape of Earth Earth is fat at the center! It is not a circle or sphere! Oblate Spheroid How do we ... – PowerPoint PPT presentation

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Title: Earth


1
Earth
2
Models
  • Model is a representation of an object or event.

3
Shape of Earth
  • Earth is fat at the center!
  • It is not a circle or sphere!
  • Oblate Spheroid

4
How do we know the Earth is roundish ?
  • When I look at the sky the sun rises and sets!
  • Stars appear to rise and set!
  • When I look in the distance it is flat!
  • Prove it how do we know its shape.

5
Proof
  • Sinking Ship Theory
  • Back in the day (a Tuesday-btw) when ships would
    leave port the families would watch the ship sink
    in the distance, only to find out that they were
    fine!

6
Proof
  • Gravity
  • Because Earth is not perfectly round the amount
    of pull the Earth has (gravity) varies.
  • At the poles you
  • weight more
  • At the Equator you
  • weight less

7
Proof
  • Pictures
  • Our best evidence is pictures from space!

8
Proof
  • Shadows on the moon (eclipse)
  • As the Earth blocks the sun a shadow appears on
    the moon.

9
Structure of Earth
  • Lithosphere
  • Crust and rigid mantle ends at the MOHO.
  • Hydrosphere
  • All liquid layer on the surface of the earth.
  • Atmosphere
  • Shell of gas around the surface.

10
Layers of Earth
  • Lithosphere Crust and rigid mantle ends at the
    MOHO. 2.7-3.0g/mL 5-60km deep.
  • Mantle Asthenosphere or plastic mantle 60-2900km
    deep.
  • Outer Core 2900-5100km deep made of liquid iron
    and nickel.
  • Inner Core 5100-6300km made of solid iron and
    nickel.

11
Layers of the Earth
12
ESRT Chart
Earths Layer Temperature Range (oC) Pressure Range (million ATM) Density Range (g/mL) Depth Range (km)
Crust (lithosphere) (Solid)
Mantle (Solidish)
Outer Core (liquid)
Inner Core (Solid)
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