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Plate tectonics
Question | Answer |
---|---|
Mid-ocean ridge | In 1960 Harry Hess discovered huge cracks in the ocean crust |
Sea floor spreading | Along the mid-ocean ridge magma rises through the crust hardened and creates new land |
Plate tectonics | Explains the formation and movement of the Earth's plates |
Plate boundaries | Where two plates meet |
Transform boundaries | Two plates slip past each other in opposite directions Causes faults, which breaks in Earth's crust Earthquakes are common in these areas |
Divergent boundaries | Two plates move apart In the ocean this forms mid-ocean ridges -place where magma comes up through the ocean 's crust On land Rift Valley's |
Convergent boundaries | Two plates come together and collide In the ocean this causes ocean trenches to form On land mountains form |