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PLATE TECTONICS/EARTHQUAKES/VOLCANOES PANGEA—LARGE SUPERCONTINENT OF LAND THAT EXISTED MILLIONS OF YEARS AGO PLATE TECTONICS—THEORY THAT THE EARTH PLATES DRIFTED TO THEIR PRESENT LOCATION PLATES—LARGE PIECES THAT THE LITHOSPHERE IS BROKEN INTO EARTHQUAKE—SHAKING OF THE GROUND CAUSED BY PRESSURE UNDER THE SURFACE MAGNITUDE—STRENGTH OR POWER OF AN EARTHQUAKE SEISMOGRAPH---INSTRUMENT USED TO MEASURE GROUND MOVEMENTS DURING QUAKES RICHTER SCALE—RATING OF THE SIZE OR MAGNITUDE OF EARTHQUAKES (NUMBER) PLATE BOUNDARY—CRACKS BETWEEN THE PLATES OF THE LITHOSPHERE FAULT—BREAK IN THE CRUST WHERE SLABS OF CRUST SLIP PAST EACH OTHER EPICENTER—POINT ON THE SURFACE DIRECTLY ABOVE THE FOCUS OF AN EARTHQUAKE FOCUS—POINT UNDER THE SURFACE WHERE THE EARTHQUAKE STARTS STRESS—POWERFUL FORCES THAT SHIFT OR CHANGE THE ROCK OF THE CRUST. COMPRESSION---STRESS WHERE 2 PLATES PUSH TOGETHER SHEERING—STRESS THAT PUSHES ROCK MASSES IN OPPOSITE DIRETIONS TENSION—STRESS THAT PULLS OR STRETCHES THE CRUST P WAVES—WAVES THAT COMPRESS OR EXPAND IN DIRECTION OF THE WAVE S WAVES—WAVES THAT VIBRATE SIDE TO SIDE ALONG THE WAVE SURFACE WAVES—WHEN P AND S WAVES REACH THE EARTH’S SURFACE