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How Plates Move

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How Plates Move - PowerPoint PPT Presentation


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Earth’s lithospheric plates move at a rate of about 2 to 5 centimeters per year (1 to 2 inches); about the same speed that your fingernails grow. Why do they move?. How Plates Move.

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Earth’s lithospheric plates move at a rate of about 2 to 5 centimeters per year (1 to 2 inches); about the same speed that your fingernails grow. Why do they move?

how plates move
How Plates Move

All the land on earth floats, but not on water. It floats on the Mantle of semi-liquid rock just beneath Earth\'s crust. The mantle is solid in its center, but soft on its upper boundary. Like a thick liquid, the upper mantle has convection currents--which make the plates move. When the mantle oozes out of a plate boundary, or out of a volcano, we call it lava.

slide3

The continents float around on the surface of the earth in super-slow-motion. They float on "rafts" of rock called tectonic plates . There are about 8 major plates, and many small plates.

theory of continental drift
Theory of Continental Drift

Alfred Wegener’s Theory of Continental Drifts suggests that continents were once a single land mass that drifted apart.

Fossils of the same plants and animals are found on different continents

Called this supercontinent Pangea, Greek for “all Earth”

245 Million years ago

Split again – Laurasia & Gondwana 180 million years ago

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