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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? – 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 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
