Plate tectonics
Published on Nov 18, 2015
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PRESENTATION OUTLINE
SLAB PULL
PULL OF GRAVITY ON A PLATE THAT'S BEING SUBDUCTED
RIDGE PUSH
new less dense crust forming at divergent plates pushes older crust away; older crust is pulled by gravity
DIVERGENT PLATE BOUNDARY
WHEN TECTONIC PLATES DIVERGE, OR MOVE AWAY FROM EACH OTHER
RIFT VALLEY
- lowland that forms between mountain ranges
- land form that results from a divergent plate
MID OCEAN RIDGE
UNDERWATER MOUNTAIN RANGE CAUSED BY DIVERGENT PLATE BOUNDARIES
CONVERGENT PLATE BOUNDARY
WHEN TWO TECTONIC PLATES CONVERGE, OR MERGE
OCEAN VS CONTINENTAL
DEEP SEA TRENCHES WITH VOLCANIC ARCH
OCEAN VS OCEAN
TRENCH WITH ISLAND ARCH OR UNDERWATER VOLCANIC ARCH
WHAT'S A SUBDUCTION ZONE?
THE PROCESS IN WHICH ONE PLATE SLIDES BENEATH ANOTHER AT A CONVERGENT BOUNDARY
DEEP OCEAN TRENCH
DEEP DEPRESSION IN THE OCEAN FLOOR, SOMETIMES ABOVE SUBDUCTION ZONES
AN EXAMPLE OF A DEEP OCEAN TRENCH
IS MARIANA'S TRENCH
TRANSFORM PLATE BOUNDARY
WHEN TWO PLATE TECTONICS SLIDE PAST EACH OTHER
AN EXAMPLE OF A TRANSFORM BOUNDARY
IS THE SAN ANDREAS FAULT
HOT SPOTS
A REGION WITH WARM TEMPERATURES RELATIVE TO ITS SURROUNDINGS
HAWAIIAN ISLANDS
FORMED BY MILLIONS OF YEARS OF VOLCANIC ERUPTIONS
When heat of the overlaying rock melts, it floats to the surface and finds its way to the crust. It can then form an island volcano.
Photo by pierre c. 38
Hot spots support plate tectonics because when islands form, it does not move because its near the Pacific Plate, which does not move.
Photo by pierre c. 38
OCEAN VENTS
CRACKS IN THE EARTH DUE TO MOVEMENT OF TECTONIC PLATES
GEYSERS(OLD FAITHFUL)
HOT SPRING WHERE WATER BOILS THEN SHOOTS IN THE AIR, ALONG WITH STEAM
