EarthquakesExamines the phenomenon of earthquakes, describing how and where they occur, how they can be predicted, and how much damage they can inflict. |
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aftershocks Alaska ANTARCTIC PLATE beneath built cause close cracked damage deep Desert destroyed destruction Dozens dropped earth earth's crust earthquake ever recorded earthquakes take place East effects energy enormous feet felt float focus four Friday ground happened heavy high building houses huge hundreds instruments Intensity Japan killed land larger layer Major Earthquake Zones mantle Marina district medium-sized ments Mercali Mexico City miles million minutes move movement is called NORTH AMERICAN PLATE notice offset Pacific Ocean PACIFIC PLATE Pacific Ring quakes occur quicksand RELEASED Richter Scale Ridge Ring of Fire rocks San Andreas Fault San Francisco sand boils Scale to measure School Scientists cientists Sections seismograph shocks shook shows side slight slip slowly soil solid Sometimes SOUTH southern California speeds Stay STRESS stretched strike suffered sured thousand tion tremor turn United violent earthquake waves weeks West Coast World