Inside the Earth

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Inside the Earth
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Layers of the Earthfozzils1

• Layers of the Earth - YouTube

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(No Transcript)
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Composition (What it is made of)

• Crust
• Mantle
• Outer Core
• Inner core

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The Crust

• Outer layer
• 5-100 km thick
• 2 types of crust
• Oceanic (very dense, made of basalt)
• Continental (less dense, made of granite)

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Oceanic and Continental Crust
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Density of the different crusts, mantle

• Density of the continental crust is less than
  oceanic crust and mantle.

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Tectonic plates
The crust of the Earth is broken into many pieces
called plates that move.
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Plates -- Lithosphere

• The crust and the upper layer of the mantle
  together make up a zone of rigid, brittle rock
  called the Lithosphere.
• The plates "float" on the soft, semi-rigid
  asthenosphere. The asthenosphere is in the
  middle part of the mantle.

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The Mantle

• Middle layer
• Is where convection currents form

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(No Transcript)
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Mantle convection cell and continental drift video

• mantle convection cells and continental drift.wmv
  - YouTube

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Outer Core

• Liquid iron nickel

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The Inner Core

• Made mostly of iron
• solid
• 1/3 of the earths mass
• Very hot
• Very dense
• (extreme pressures)

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How does density of each layer changes as you go
towards the center of the Earth?
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• Which of the following graphs best represents the
  relationship between density and depth of
  material below Earths surface?

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Earths Layers

• How are the earths layers similar to an egg?
• Shellcrust
• Egg whitemantle
• Yolk inner and outer core

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Physical Structure of the Earth

• A. Identify each of the three layers.
• B. Describe one characteristic of
• layer X.
• C. Describe one characteristic of
• layer Y.
• D. Describe one way layer Y
• interacts with layer Z.

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What evidence do we have that the earths crust
is split into tectonic plates that move?
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Pangaea
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Why do we believe that the earth formed one
supercontinent Pangaea? 1. Fossil evidence2.
fit together like a puzzle3. Same type of rocks
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Earths history in the last 600 million years