A solid that has atoms arranged in a repeating pattern .
CRYSTAL
The smallest piece of matter that can still be identified as that matter.
ATOM
Rock that forms when melted rock cools and becomes solid .
IGNEOUS ROCK
Rock that forms from small pieces of rock and minerals that are cemented together .
SEDIMENTARY ROCK
Rock that forms from rock that has been changed by high temperatures , high pressure , and hot liquids and gases .
METAMORPHIC ROCK
a series of actions that changes one type to another
Rock cycle