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where 2 plates come together

they can go any many directions

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many different types of plates

plates can carry many many different types of crust

where the the epicenter is can help identify plates

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piece of the lithosphere

can move around on the planet's  surface

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a very old piece of equipment

used to measure seismic waves and other ground movements

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point on the earth's surface

directly above the focus of an earthquake

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Discovered by Harry Hess during WW2

mechanism for drifting continents

pushes lithospheric plates o the earth's surface

the formation of new seafloor at spreading ridges

a mixture of different ideas and data

takes place as plates separate

happens when the mantle convects

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Wegener made an observation about the continents

He observed they all fit together like puzzle pieces

He believed they were all once together as a whole and they got split apart

He provided tons of information about this theory

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Hot material rises

Cool material sinks

moves in a circular pattern

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He was the man who came up with the continental drift hypothesis

He was born in 1880

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brings together Continental Drift and the Seafloor Spreading Hypothesis

The theory answers many geologic questions

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plates move around the earth's surface about a few centimeters a year

a conveyer belt is a good way to describe this