Plate Tectonics 10.2 08 09

Ch 10 Plate Tectonics ,[object Object]

After Wegener’s hypothesis of Continental Drift was rejected… ,[object Object],[object Object],[object Object]

Columbia University’s Vema Instrumental in discovering the Mid-Atlantic Ridge in 1950’s

Theory of Sea Floor Spreading ,[object Object],[object Object]

Glomar Challenger sampling ocean floor rock in 1968

Ages of rock get older as the distance from rift zones increases.

Deep sea vents found in 1976 Woods Hole Oceanographic Institute’s submarine, Alvin

[object Object],Magnetic evidence for Theory of Sea Floor Spreading

Earth’s magnetic field has reversed many times!

When lava or magma solidifies, it provides us with a record of Earth’s magnetic field

Lava contains iron crystals which orient themselves to Earth’s magnetic field before solidifying

Magnetic Reversals also show that new rock forms at rift zones

Geomagnetic Reversal Time Scale

Summing up 10.2: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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