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Motion
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…
– 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
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