NATS 1880 Lecture Notes - Lecture 10: Outer Core, Phanerozoic, Hydrosphere
27 Aug 2015
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Document Summary
Earth is 12000 km is diameter solid core -> liquid outer core -> mantle -> lithosphere -> crust. Earth active surface since there are multiple convection currents beneath the earth"s surface. At a spreading zone the plates move away from each other the plates can be moving alongside one another in opposite directions (transverse boundary) The plates can be colliding as they move into one another (convergent boundary) At spreading zones new land, usually seafloor is being created. When a spreading zone first forms it can be on land but because they tend to be at lower elevations, eventually they are flooded and end up underwater. Regions where one plate is sliding under another. Near these zones there tend to be strong earthquakes, and explosive volcanic activity. Where the plates are moving into one another one plate slides under the other this is called a subduction zone, this collision of plates creates a mountain range.
