Ancient plants - PowerPoint PPT Presentation

Plate Tectonics

17.1 Drifting Continents. Plate Tectonics. Early Observations. In the late 1500s, mapmakers noticed the apparent “fit” of the continents on either side of the Atlantic Ocean. But what could be the cause?. Continental Drift- Pangea. Proposed in 1912 by German scientist Alfred Wegener

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heat from Earth’s center

non polluting free. can’t be placed everywhere. heat from Earth’s center. renewable. non polluting free. not reliable (cloudy, night). Sun (nuclear fusion). perpetual. heat released when atoms split/fused. non polluting air not expensive. waste is radioactive. nonrenewable.

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