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Transcript of Plate Tectonics
Died-August 25, 1969
Occupation-Geologist and Sailor in U.S. Army and Harry Hess Continental & Oceanic Crust -Heat in earth's core
-Hot spots deep in Earth cause convection currents
- the currents cause the plates to move very slowly. What causes the plates to move? Seafloor Spreading what causes plate tectonics Plate Tectonics Two plates sliding past each other Ocean crust is the thinnest crust
Continental crust is thickest
Continental crust is oldest
Continental crust 40 milesdown
Oceanic crust 2.5-3 miles down Existed over 225 million years ago
Slowly slid away
40 millimeters away a year a theory that ascribes continental drift
formation of mountain belts
moving plates of the Earth's crust
supported on less rigid mantle rocks Pangea Plates moving away
Causes magma to move up
New ocean floors
Causes deep trenches
Caused by new oceanic crust
Moves 5cm a year -the structure of the Earths' layers
-solid rock on the crust move around on top of magma
-like cookie pieces floating in milk. Harry Hammond Hess was a geologist and United States Navy officer in World War II. Considered one of the "founding fathers" of the unifying theory of plate tectonics, Rear Admiral Harry Hammond Hess was born on May 24, 1906 in New York City. THE END