Download plate tectonics/earthquakes/volcanoes pangea—large

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