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Inside the Earth

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Inside the Earth THROW YOUR HANDS UP FOR THE LAYERS OF THE EARTH How do we know what s there? Seismic waves P waves S waves Kinds of Seismic Waves Primary Waves (P ... – PowerPoint PPT presentation

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Title: Inside the Earth


1
Inside the Earth
2
Throw your hands up for the layers of the Earth
3
How do we know whats there?
  • Seismic waves
  • P waves
  • S waves

4
Kinds of Seismic Waves
  • Primary Waves (P waves)
  • Compress and expand
  • Material moves in same direction of wave
  • Fastest
  • Go through Solids, Liquids, and gases

5
Kinds of Seismic Waves
  • Secondary Waves (S waves)
  • Arrive after P waves (slower than P)
  • Go through Solids only
  • Move side to side, and up and down
  • Material moves perpendicular to wave

6
Anatomy of an Earthquake
7
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9
Layers of the Earth
  • Crust
  • Mantle
  • Core

10
How is the Earth like a Peanut mm?
11
The Crust
  • Outermost layer
  • Coolest layer
  • Thinnest layer

Crunchy!!
12
2 types of Crust
  • Oceanic
  • very dense
  • made of basalt
  • 0-9 miles thick
  • Continental
  • less dense
  • made of granite
  • 16-56 miles thick

13
moho
14
Lay 3 pieces of paper on a basketball. THATs the
average thickness of Earths crust.
15
The Mantle
  • Middle layer
  • Very thick layer (1,800 miles, most of Earths
    mass, 84 volume)
  • 1,000-7,000oF
  • (Thermite2500-4500oF)
  • Olivine, iron, magnesium

16
Convection Currents
17
The Core
  • Made mostly of iron
  • 1/3 of the earths mass
  • Very hot (8,000-12,000oF)
  • Very high pressure

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20
Heat Transfer
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Physical Structure of the Earth (5 Layers)
  • Lithosphere- rigid outer layer (crust and
    uppermost mantle)
  • Asthenosphere- solid rock that flows slowly (like
    hot asphalt middle mantle)
  • Mesosphere- middle layer (solid, lower mantle)
  • Outer Core- liquid layer
  • Inner Core- solid, very dense

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