Earth

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• Earths Interior

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Lets Take a Journey to the Center of the Earth

• There are three main layers of Earth
• The CRUST
• The MANTLE
• The CORE
• All three layers differ in size, composition,
  temperature, pressure density

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Temperature

• As you travel to the center of the Earth the
  temperature gets warmer
• For every 40 meters you descend the temperature
  increases 1 degree Celsius

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Pressure

• PRESSURE results when a force is pressing on an
  area
• Pressure increases as you go deeper into the Earth

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The Crust

• Between 5 70 km thick
• Crust beneath oceans oceanic crust
• Made up of BASALT dark rock/fine texture
• Crust that forms continents continental crust
• Made mainly of GRANITE light color/coarse
  texture

• CRUST layer of rock that forms Earths outer
  skin
• Includes both dry land and the ocean floor
• Also the soil and water that covers earths
  surface
• Thin layer
• Thickest under mountains thinnest beneath ocean

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The Mantle

• layer of hot rock (but solid)
• Over 3,000 km thick
• Divided into 2 layers
• Upper Mantle
• Lithosphere crust and uppermost part of the
  mantle about 100 km thick
• Asthenosphere upper mantle just below the
  lithosphere
• Hotter and under more pressure
• Softer/bends like plastic (but still solid)
• Lower Mantle

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The Core

• Made up of metals iron and nickel
• 2 parts
• OUTER CORE layer of molten metal that surrounds
  the inner core
• INNER CORE dense ball of solid metal
• Pressure squeezes the atoms of nickel and iron so
  much to where they cannot spread out, so they
  become liquid
• Scientists think the movements in the liquid
  outer core create Earths magnetic field

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Spell o roma

• Lith (o sphere)
• As then (o sphere)

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Review Questions

• Why is it difficult to determine Earths inner
  structure?
• What is the difference between the lithosphere
  and the asthenosphere?
• How do temperature and pressure change as you go
  deeper into the Earth?
• How are oceanic and continental crusts alike and
  different?
• Place these terms in correct order so they begin
  at Earths surface and move toward the center
  inner core, asthenosphere, crust, lithosphere,
  and outer core

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More Review Questions

• 6. Write whether each statement is true or
• false
• a. continental crust is made up of rocks such as
  granite
• b. the relatively soft layer of the mantle is
  called the asthenosphere
• c. the Earths core is made up of iron and
  copper