Rocks Minerals Crystals?

Answer

Rocks, minerals, and crystals are fun to study if you are interested in geology. The entire earth is made up of rocks and minerals. Rocks are made of 2 different types of minerals. There are around 3000 different types of minerals, sorted into 8 groups. Crystals are minerals that have grown into different shapes. Crystals form when the liquid minerals inside the earth cool, and harden. Most crystals take thousands of years to grow; but some, like salt, grow so quickly that you can see them growing.
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