Plate Tectonics Review. Earth’s Structure. Lithosphere : rigid, outer crust of the earth Rocks are less dense, more rigid than those in asthenosphere Sial : continental crust. Less dense than oceanic crust. Granite most common type of rock
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Instruments that record earthquakes are called seismographs
Earthquakes are measured using the Richter Magnitude Scale- each number on the Richter Scale represents a magnitude of 10x larger than the previous number (eg. 7 earthquake is 10x larger than 6, and 100x larger than a 5)
Composite volcanoes (andesitic volcanoes): erupt different materials at different times. Built up in layers of lava and ash. Symmetrical, often snow and ice capped (like those around the ring of fire). Violent, sudden eruptions.
The heat from these can cause lahars (mudflows) from melted snow/ice