Slow Motion on Planet Earth Chapter 1 Section 2

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Presentation transcript:

Slow Motion on Planet Earth Chapter 1 Section 2

Tectonic Plates Pieces of Earth’s Crust 12+ major plates

Pangaea “Super-Continent” ~250 million years ago

Theory of Plate Tectonics Earth’s plates move slowly in different directions Divergent Move away Convergent Move into Transverse Move along

How Fast Do Plates Move??? Slow plates… Fast plates… 1-2 mm’s per year Fast plates… 5-6 cm’s per year About as fast as your finger nails grow 

San Andreas Fault, CA L.A. is on the Pacific Plate Moving NNW at 3 cm’s per year San Francisco is on the N. American Plate Moving SSE at 2 cm’s per year Now… 544 km apart In 10 million years Side by side