Seafloor spreading theory ppt.
The sea floor spreading theory powerpoint presentation.
The mid ocean ridge curves like the seams of a baseball along the sea floor extending into all of earth s oceans.
3 sea floor spreading sonar a device that bounces sound waves off under water objects and then records the echoes of these sound waves.
The molten material spreads out pushing older rock to both sides of the ridge.
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Powerpoint click to download the ms powerpoint file 34 mbytes pdf click to view or download the presentation in pdf 2 1 mbytes ht ml cl ick to view the presentation in html format.
141 147 seafloor spreading until the 1950 s little was known about the ocean floor but after sonar was invented a complex ocean floor.
Mid ocean ridge the longest chain of mountains in the world these are divergent plate boundaries.
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The seafloor spreading theory powerpoint presentation.
At the mid ocean ridge molten material rises from the mantle and erupts.
The time it takes for the.
In 1912 when alfred wegener proposed that the continents had once been joined together and had split apart the biggest weakness in his hypothesis was the.
Seafloor spreading theory evidence ppt.
Seafloor spreading theory slideshare.
Seafloor spreading seafloor spreading 5 4 p.
This process that continually adds to the ocean floor is sea floor spreading.
During world war ii geologist harry hess became interested in mapping the ocean floor using sonar.
Differentiate continental crust from oceanic crust and explain why the continental crust is older than the.
Mapping the mid ocean ridge the east pacific rise is just one part of the mid ocean ridge the longest chain of mountains in the world.
Powerpoint ppt presentation free to view.
Evidence for sea floor spreading in 1960 harry hess studied wegener s theory hess proposed the radical idea that the ocean floorsmove like a conveyer belt which in turn move thecontinents this movement begins at the mid ocean ridge whichforms along in a crack in the oceanic crust.
Mid ocean ridge the longest chain of mountains in the world these are divergent plate boundaries.
In the 1960s scientists found evidence that new.
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27 evidence for sea floor spreading.
Enumerate and explain the evidences that support the sea floor spreading process.
Most of the mountains in the mid ocean ridge lie hidden under hundreds of meters of.
S eafloor spreading this presentation reviews the major features of the seafloor and harold hess original theory of seafloor spreading.
