PLATE TECTONICS
Plate tectonics is a relatively new theory that has revolutionized the way geologists think about the Earth. ... Plate tectonics is a combination of two earlier ideas, continental drift and sea-floor spreading. ...
Plate boundaries occur where two plates are moving apart from each other. When plates break apart, the lithosphere thins and ruptures to form a plate boundary. ... On land,plate boundaries create rift valleysdeep valley depressions formed as the land slowly splits apart. ... The Mid-Atlantic Ridge is an underwater mountain range created at a plate boundary in the middle of the Atlantic Ocean.
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