FNR 10300 Chapter Notes - Chapter 12: Mining, Mass Wasting, Estuary
1 Nov 2016
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Core (interior)- composed of a dense, intensely hot mass of metal, mostly iron, which is thousands of kilometers in diameter. High concentration of lighter elements (oxygen, silicon, and magnesium) Tectonic plates- huge block of earth"s crust that slide around slowly, pulling apart to open new ocean basins or crashing ponderously into each other to create new, larger landmasses. Mid-ocean ridges- mountain ranges on the ocean floor where magma wells up through cracks and creates new crust. Eight most common chemical elements in whole earth and crust. When an oceanic plate collides with a continental landmass the continental plate usually rides up over the sea floor and the oceanic plate is subducted. Subducted- pushed down into the mantle where it melts and rises back to the surface as magma (deep ocean trenches mark these zones) Over millions of years continents can drift very long distances. Era time frames (in millions of years before present)
