Crust and plates

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Crust and plates

  1. 1. Crust and Plates<br />
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  9. 9. From the last lesson we know that the Earth’s crust is a thin fragile layer, made up of<br />Oceanic crust is:<br />Mostly dense basalt<br />5-10 km thick<br />“Young” No more than 200 million years old<br />Continental crust is<br />mostly less dense granite<br />Up to 50 km thick<br />Very old-rocks up to 3.5 billion years<br />

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