SE

Science

^^Earth crust:^^

  • The outer layer of the earth.

  • thinnest layer

  • Made up of both continental
    (land)and oceanic crust(under
    the ocean).

  • least dense

  • Composed of mostly granite and basalt

    @@Earth@@ @@Mantle:@@

  • ^^Largest layer of the Earth^^

  • ^^Composed of silicate rocks rich in
    magnesium and iron^^

  • Intense heat causes the rocks to rise
    and then cool and sink.

  • ^^The process is called convection,
    which causes the crust to move.^^

  • Average temperature 3000

  • ^^Made up of mostly magma^^

  • ^^Contains convection currents that move the tectonic plates^^

^^Earth^^ ^^outer^^ ^^core^^^^:^^

  • Liquid layer 2,300 km thick, second larges
  • Composed of liquid iron and nickel
  • Lies between inner core and mantle
  • Because the magma moves around the inner core, Earth’s magnetic field is created.

Average temperature 4000o -5000o

%%Earth%% %%Innercore:%%

  • ^^A solid ball of metal^^
  • ^^Made of solid nickel and iron^^
  • ^^Densest layer of the Earth^^
  • Average temperature 5000-6000
  • Spins at a speed faster than the Earth
    rotates
  • ^^So hot it melts everything in the outer
    core^^
  • ^^a soild^^

^^Seismic:^^

  • Seismic waves are used to
    determine which layers of the
    Earth are solid or liquid.

  • Some seismic waves cannot
    pass through certain layers
    giving us a clue to the layer’s
    composition.

    ^^Oceanic Crust:^^

  • A thin layer of crust that
    overlies the ocean basins

  • More dense than continental
    crust

  • Mostly basalt rock

  • Thinner than continental crust.

  • Younger (newer) than
    continental crust

    Continental Crust

    ^^Continental Crust:^^

  • Layer of rock which forms the
    continents

  • Less dense than oceanic crust

  • Mostly granite

  • Thicker than oceanic crust

  • Older than oceanic crust