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Slow Motion Earth

Slow Motion Earth. How do we know slow objects are moving? Plates Broken pieces of Earth’s crust Theory of Plate Tectonics Earth’s plates move ever so slowly in all directions. Calculating Distance. If the pacific plate moves 5 cm a year, how far will it move in 1,000 years?

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Slow Motion Earth

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  1. Slow Motion Earth • How do we know slow objects are moving? • Plates • Broken pieces of Earth’s crust • Theory of Plate Tectonics • Earth’s plates move ever so slowly in all directions

  2. Calculating Distance • If the pacific plate moves 5 cm a year, how far will it move in 1,000 years? • 5 cm x 1000 yr = 5000 cm which is 50 m • What would this convert to per day? • 5 cm ÷ 365 days = .0137 cm/day

  3. Predicting • Los Angeles is on the Pacific Plate moving northwest. San Francisco is on the North American Plate moving southeast. These 2 cities are moving toward each other at 5 cm/yr. If the two cities are 554,000 m apart, how long will it take the two cities to meet? • 554,000 m x 100 cm/m = 55,400,000 cm • Time = 55,400,000 ÷ 5cm/yr = • 11,080,000 years

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