History of the Universe

History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Crust

The crust of the Earth is a thin rigid layer of rock. It floats on the mantle.

It is made mostly of a layer of dark rock called basalt 5-10 km thick. The oceans lie above this layer. Trapped in this basalt are lumps of thicker rock similar to granite 30 - 40 km thick. These lumps stick out of the oceans to form the continents.

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History of the Universe eBook
History of the Universe eBook
Only $2.99

Written by Wyken Seagrave
Copyright © 2017 Penny Press Ltd