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Convection Notes.

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Presentation on theme: "Convection Notes."— Presentation transcript:

1 Convection Notes

2 Hot Stuff Rises Cool Stuff Sinks
Convection Currents Hot Stuff Rises Cool Stuff Sinks

3 Arthur Holmes In 1929 said that convection currents
in the mantle could create enough force to move continents.

4 Watch ‘em go!

5 Mid-Ocean Ridges Huge, long mountain ranges that
run along the middle of the ocean floor. There is a deep rift valley that runs along the middle of the range.

6

7 Magnetic Reversals In earth’s history, the magnetic polarity has flipped back & forth. These changes are recorded in igneous rocks.

8 Magnetic Reversals Fe crystals from the MORs lined up w/ the switching magnetic poles, forming “stripes” which showed new oceanic crust was being formed & pushed away from the rift valley.

9 Seafloor Spreading The theory that states that as oceanic plates are pulled apart, new ocean floor is formed at rift valleys. Take a ride!

10 Theory of Plate Tectonics
States that the Earth’s crust is broken into pieces called lithospheric plates that float on the asthenosphere and are carried around by convection currents.

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