Science { g10 rev.}

• Antonio snider pellegrini


  French geographer and scientist that theorize that the west coast of Africa and the east coast of south America had once beed connected as a single continent
• Pangaea


  Around 250 million years ago, during the mesozoic era or the age of dinosaurs, all the land on earth was connected as one Gian continent
• Panthalassa


  A superocean that surrounds the supercontinent
• Alfred lothar Wegner


  A German meteorologist and geophysicist, famous for proposing the continental drift theory in 1910
• Plate tectonics theory


  Explains that Earth's outer shell is broken up into several slabs or rock plates
• The four main layers of Earth

  • Core
  • Lower mantle
  • Upper mantle
  • Crust
• Core


  Made up of heavy metals
• Crust


  Lightest sedimentary
• Two types of crust

  • Continental crust
  • Oceanic crust
• Lithosphere


  Upper solid part of the mantle
• Asthenosphere


  Broken into several plates that "float" on a soft layer of partially molten rock
• Plate boundaries


  The areas where these plates meet
• Three types of plate boundaries

  • Divergent
  • Convergent
  • Transform fault/ conservative boundary
• Divergent boundary


  Plates move apart and create space between them for the rising magma
• Seafloor spreading


  Responsible for the formation of oceanic rift valleys
• Rift valley


  Low-lying regions of land formed by the separation of tectonic plates
• Convergent boundary


  A region where two plates collide
• Subduction


  When two plates collide, the edge of one plates bends downward and sink beneath the opposite plate
• Subduction zone


  The area where subduction occurs
• Oceanic - continental convergence


  The edge of the oceanic lithosphere bends and sinks to the asthenosphere where viscous magma flows
• Oceanic trench


  The process of subduction forms a long, narrow depression on the ocean floor
• Marianas trench


  The most well known trench in the world
• Challenger deep


  The deepest point of the Marianas trench