Rocks
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Rocks, also referred to as Rock (singular English) are hard, but somewhat brittle molecular objects including crystals of one or more minerals. There are many variations including Basalt and Obsidian, but many simply know them as rocks.
Generally, the study of rocks is referred to as geology, not to be confused with geometry or geography. These folks study the crystalline structures of rocks.
There are many types of rocks other than geological rocks that are found in the ground. These include candy rocks, a form of hard sugar crystal; crack rocks, an addictive substance derived from cocaine; and Hot Rocks, a Rolling Stones CD.