PLATE BOUNDARIES- MOVES TOWARD EACH OTHER, MOVING AWAY FROM EACHOTHER OR SLIDE PAST EACHOTHER
LITHOSPHERIC PLATES (100 KM THICK)- BROKEN INTO PIECES OF DIFFERENT SIZES CALLED LITHOSPHERE PLATES "EARTHS PLATES"
LITHOSPHERE PLATE MOVEMENT CAN BE STUDIED AND MONITORED BY GPS TCHNOLOGY. GPS TELLS THE DIRECTION OF THE EARTHS PLATESMOVING AS THEY SHIFTON TOP OF WEAK, SOFT ATMOSPHERE
EARTHQUAKES AND VOLCANOS APPEAR ON OR NEAR PLATE BOUNDARIES AND ARE RELATED TO THAT MOTION
ASTHENOSPHERE (BETWEEN 100 KM AND 250 KM)- LAYER OF SOLID ROCK THAT CAN FLOW AND CHANGE SHAPE. THIS WEAK SOFT LAYER ALLOWS PLATES TO CONTINOUSLY MOVE AROUND SLOWLY, LEADING TO PATTERNS OF EARTHQUAKES AND VOLCANOS ON EARTHS SURFACE
