Investigating Plate Tectonics, Earthquakes, and Volcanoes

Investigating Plate Tectonics, Earthquakes, and Volcanoes — page 7
INVESTIGATING PLATE TRCTONICs EARTHQUAKES AND VOLCANOES Ocean oceanic crust continental crust 10 lithosphere Mohorovičić discontinuity rigid rocks 100 low velocity zone partial melting of rocks 200 asthenosphere 300 H weaker plastic rocks upper mantle S 400 mechanically strong rocks 500 6004 700 lower mantle 2 900 A cross section shows Earth's outer layers subdivided according to their physical properties The crust and the uppermost part of the mantle form the rigid lithosphere Below that is a partly molten some which overlies a more rigid one Encyclopaedia Britannica Inc I2