| A | B |
|---|
| rock | A naturally formed solid that is usually made up of one or more minerals. |
| rock cycle | The set of natural, repeating processes that form, change, break down, and re-form rocks. |
| igneous rock | Rock that forms as molten rock cools and becomes solid. |
| sedimentary rock | Rock formed as pieces of older rocks and other loose materials get pressed or cemented together or as dissolved minerals re-form and build up in layers. |
| metamorphic rock | Rock formed as heat or pressure causes existing rock to change in structure, texture, or mineral composition. |
| intrusive igneous rock | Igneous rock that forms as magma cools below Earth's surface. |
| extrusive igneous rock | Igneous rock that forms as lava cools on Earth's surface. |
| metamorphism | The process by which a rock's structure or mineral composition is changed by pressure or heat. |
| recrystallization | The process by which bonds between atoms in minerals break and re-form in new ways during metamorphism. |
| foliation | The arrangement of minerals within rocks into flat or wavy parallel bands. |
| sediment | Loose pieces of rocks, minerals, or animal and plant remains that settle in the water or out of the air. |
