Tectonic Plates Review the Layers Alfred Wenger’s Pangaea

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Presentation transcript:

Tectonic Plates Review the Layers Alfred Wenger’s Pangaea Sea Floor Spreading Magnetic Reversal

The Earth has Layers

Alfred Wegener 1880 - 1930 Continental Drift Theory 1913 Theory had few believers Continental drift became Plate Tectonics in the 1970s

OK…but where’s your evidence?? Fossils on two separate coasts… Similar climate conditions Glacier cuts

Pangaea Pangaea=“all Earth” Panthalassa=“all sea” 180 million years ago 245 million years ago

Gon-da-wan-na-who?! Laurasia Gondwana But what’s a strong enough force to move continents??

Dr. Evil?

Chuck Norris?

Mr. Kotsch?

The Secret: Sea Floor Spreading

Directions of Plates Now Plates on the move Directions of Plates Now

Mid-Ocean Ridges

Earth’s Magnetic Field

Magnetic Stripes

Slab Pull-Push

Boundaries

Boundaries cont.

Faults

Normal Fault

Normal Fault cont.

Reverse Fault

Reverse Fault cont.

Strike-Slip Fault

Strike-slip cont.

Folds

Anticline and Syncline