A den for bears and a bedroom for bats. A home for prehistoric people. A dark place of gloom and mystery. A sparkling wonderland of strangely shaped rocks. That's a cave! A cave is simply a hole in...
Flat sides and sharp corners
A chunk of mineral may seem to be just a jagged, lumpy, or twisty piece of hard stuff with no special shape. But each kind of mineral is actually made up of tiny shapes called crystals---shapes that...
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