Geography - Earth and Crust

• Destructive


  Heavier oceanic plate meets lighter continental plate

  Sinks to mantle making it melt

  Hot magma rises and erupts making volcano
• Collision


  Two plate with same density that push/converges
• Constructive / Divergent


  Two tectonic plates pulled in opposite ways

  Magma from mantle rises to earth's surface
• Conservative


  Tectonic plates move parallel

  When moves past, stress builds till earthquake occurs
• Convection Current


  Heat in gas/liquid is transferred from a warm to a cooler place by upward movement
• Oceanic crust


  Thinner 5-10km

  Dense, can sink and made from basalt

  Made and destroyed

  0.099% of earths mass

  0.147% of mantle/crusts mass
• Continental


  Thicker, 25-100km

  Less dense and made from granite

  Never made and destroyed

  0.374% of earths mass

  0.554% of mantle and crusts mass
• Crust


  Solid and rocky

  Fragmented by tectonic plates
• Mantle


  Hot , dense

  Liquid rock
• Outer Core


  Liquid

  4030-5730C
• Inner Core


  6000C

  Solid
• Tectonic Plates


  Large fragments of crust
• Magma


  Molten rock in mantle
• Mantle


  Molten rock between core and crust
• Plate boundary


  Point where two plates meet