History of the Universe

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

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Sand

Part of rock which is produced by weathering or by the action of the sea.

Most sand is light in color and is made of quartz.

Later four small rocky planets formed near the Sun: Mercury, Venus, Earth and Mars. As we shall see, life later evolved on one of these (Earth). These planets too had almost circular orbits. If they had oval orbits, life could not have evolved.

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