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Introduction
to Rocks & Minerals
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The
whole earth is made of rocks & minerals. Inside the earth there
is a liquid core of molten rock and on the outside there is a hard crust.
If you compare the earth to an egg, the shell on an egg is like the
crust on the earth. The crust is made up of rocks and minerals. Much
of the crust is covered by water, sand, soil and ice. If you dig deep
enough, you will always hit rocks.
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