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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”
245 million years ago
180 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
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
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