Plate Tectonics
Published on Nov 06, 2015
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PRESENTATION OUTLINE
PLATE TECTONICS
Photo by Beechwood Photography
Plate tectonic definition:
The theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithosphere plates that move slowly over the underlying mantle.
Photo by BlatantWorld.com
Divergent:
Seafloor spreading
Convergent:
Mountain building, volcanoes, deep ocean trench.
Photo by mrwalshm2m3
Convection currents in the mantle act like conveyor belts that drag the plates around.
Photo by TC Morgan
Gravity pulls on the end of plates at subduction zones and pulls them toward the center of the earth.
Photo by Ken Lund
New earth forms at divergent boundaries and pushes plates apart.
Photo by Ben Andreas Harding
Divergent plate boundary:
A linear feature that exists between two tectonic plates that are moving away from each other.
Photo by Glyn Lowe Photoworks.
Convergent plate boundary:
Is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.
Photo by pmlbird
Ocean - Ocean
Trench with island arch or underwater volcanic arch.
Photo by Wonderlane
Subduction Zone:
The biggest smash-up on earth, marking the collision between two of the planet's tectonic plates, the pieces of the crust that slowly move across the surface over millions of years. When two tectonic plates meet, one may slide underneath the other, curving down into the mantle.
Photo by NASA Earth Observatory
Deep Ocean Trench:
Oceanic crust is formed at an oceanic ridge, while the lithosphere is subducted back into the asthenosphere at trenches. The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor .
Resulting landform from divergent plate boundary (land)
Rift Valley
Resulting land form from divergent plate boundary
Mid-ocean ridge
Transform:
The crust is neither destroyed or formed.
Photo by NASA's Marshall Space Flight Center
Resulting landform from transform plate boundary:
Faults
Photo by mckaysavage
