Today

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Todays Agenda12-10

• Bellringer What is a model? What are they used
  for?
• Book on page 288
• Notes on Inside the Earth
• BrainPop
• Quiz on BrainPop

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Inside the Earth

• Study Pack 2

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Todays Goals

• I can explain how scientists use evidence to
  create models of the Earths interior.
• I can describe the layers of the Earth.

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What do you already know?

• True or False
• Scientists have created models of the Earth by
  drilling holes to the center of the Earth
• All of the Earth is solid
• The Earths highest temperature is at its center.
• Pressure decreases as you go toward the center of
  the Earth
• The lithosphere is another name for the inner
  core.

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Creating A Model

• What is inside the box?
• How might you figure this out without opening it?
• Indirect Observation

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Using Seismic Waves

• Earthquakes carry energy through waves
• Waves move differently through different
  materials
• Travels faster in solid rock than in liquid
• The waves refract when they move from solids to
  liquids

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Using Rock Clues

• Certain rocks on Earths surface are made from
  materials thought to be deep inside of the Earth

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Layers of the Earth

• Inner Core
• Outer Core
• Mantle
• Crust

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Inner Core

• Solid and dense
• Mostly made of iron
• When seismic waves reach this layer they speed up
  meaning it is solid
• Hottest part of Earth
• Experience a lot of pressure

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Outer Core

• Mostly molten (liquid) metal
• Stops one kind of seismic wave and slows down
  another

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Mantle

• Largest layer
• Solid but flows, similar to silly putty

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Crust

• Mostly thin, can vary
• All features on earths
  surface are part of the
  crust
• The upper part of the
  mantle and the crust
  make up the lithosphere

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Crust

• The crust is broken up into pieces called
  tectonic plates
• These plates can float on the mantle

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Patterns in Earths Structure

• Back of Foldable
• As you go from the crust to the inner core
• Density, Temperature, and Pressure INCREASE

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Now what do you know?

• True or False
• Scientists have created models of the Earth by
  drilling holes to the center of the Earth
• All of the Earth is solid
• The Earths highest temperature is at its center.
• Pressure decreases as you go toward the center of
  the Earth
• The lithosphere is another name for the inner
  core.

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Lets find out more!

• BrainPop