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Plate tectonics

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by

Kristin Davia

on 24 October 2012

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Transcript of Plate tectonics

What drives plate tectonics A FAMOUS SCIENTIST ALFRED WEGNER Volcamoes looks like a mountain with a hole on the top Volcanoes volcanoes erupt because they have hot gasses in them and magma and they want out. volcanoes such as the one in ireland explode and leave ashes in the air for a long time and delay air travel. HARRY HESS ANOTHER GREAT SCIENTIST The older, heavier plate bends and plunges steeply into the earth, it forms a trench that can be as much as 70 miles wide, more than a thousand miles long, and several miles deep. The Marianas Trench, where the enormous Pacific Plate is descending under the leading edge of the Eurasian Plate, is the deepest sea floor in the world. It curves northward from near the island of Guam and its bottom lies close to 36,000 feet below the surface of the Pacific Ocean. Earthquakes subduction zones PLATE TECTONICS Seafloor Spreading subduction zones are the plates that try to go under another plate they are measured by how much they moved in centimeters every year - Famous scientist
-Made the theory of the continental drift
-Was a meteorologist ond geologist
-Born November 1,1880
-Died November 2or3,1930 - Earthquakes occur when the plates go into
each other and pull away from each other. * Discovered by Harry Hess - The plates are constantly moving around in the
lithosphere. - The constant movement of the plates
makes the Earth shake. *Process in which the ocean floor is extendd when two plates move apart. - Pangaea is the theory that all the continents were
connected as one supercontinent. Pangaea watch the video and there causes * Magma rises through the cracks and seeps out onto the ocean floor - They slowly moved away to form the continents we have today. - The Earths gets heated and convection currents in the magma keeps
dragging the plates. - Plate tectonics lay on the lithosphere and float
on the liquid mantle.
SMFSDSDMF.DSM - Plate tectonics are constantly moving, when they
come in contact with each other, they create - This explains montains, volcanoes, and other
natural disasters certain events or create some sort of land form HARRY HESS IS THE MAN WHO DISCOVERED THAT THERE WAS SEAFLOOR SPREADING IS WHAT CAUSING THE SEA TO PRODUCE NEW ROCKS. Continental Crust Rocks found in the continental crust is called sial. Oceanic Crust rocks which are claaled sima Oceanic Crust
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