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Layers of the Earth. Geosphere. The Earth as a System. Integrated system of rock, air, water, and living things. This system is divided into four parts: atmosphere (air) hydrosphere (water) biosphere (living things) geosphere (rock). Geosphere.

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the earth as a system
The Earth as a System
  • Integrated system of rock, air, water, and living things.
  • This system is divided into four parts:
    • atmosphere (air)
    • hydrosphere (water)
    • biosphere (living things)
    • geosphere (rock)
geosphere
Geosphere
  • Solid part of the Earth’s crust that consists of all rock, and the soils and sediments on Earth’s surface.
  • Most located in Earth’s interior
earth s interior
Earth’s Interior
  • Seismic Waves: the waves that travel through the Earth’s interior during an earthquake.
  • Altered by the type of material that it travels through.
seismologists
Seismologists
  • Scientists who measure changes in these waves to determine that the earth’s interior is made in layers.
composition of the earth
Composition of the Earth
  • Three layers:
    • crust
    • mantle
    • core
  • Density increases towards the center of the Earth
crust
Crust
  • Thin, outer layer.
  • Made up of light elements
  • less than 1% of Earth’s mass
  • 5-70km thick
mantle
Mantle
  • Layer beneath the crust
  • 64% of mass of Earth
  • 2,900 km thick
  • Made of
    • lithosphere
    • asthenosphere
    • mesosphere
lithosphere
Lithosphere
  • Outer layer
  • cool, rigid
  • divided up into huge tectonic plates
asthenosphere
Asthenosphere
  • 250 km thick
  • solid, plastic layer made of rock
  • flows very slowly and allows tectonic plates to move across
mesosphere
Mesosphere
  • 2,250 km thick
  • “middle” sphere
  • lower part of mantle
slide12
Core
  • 3,248 km radius
  • sphere of hot, dense nickel and iron
  • 4,000 - 5,000 °C
  • 1/3 of the Earth’s mass
  • Made of
    • Outer Core
    • Inner Core
slide13
Outer Core; 2,200 km thick, outer shell, made of liquid nickel and iron
  • Inner Core: 1,228 km radius; a sphere of solid iron and nickel
first life
First Life???
  • First life may have first evolved deep in the crust and then migrated to the surface when conditions became favorable.
  • “extremophiles”
  • Hypothesized that the biomass below the surface far exceeds the biomass at the surface.
slide15
Be able to draw and label the three layers of the earth (crust, mantle, and core) as well as the 5 layers based on physical properties (lithosphere, asthenosphere, mesosphere, outer and inner core).
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