| A | B |
|---|
| 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 |
| Rock | A naturally formed solid that is usually made up of one or more types of minerals |
| Rock cycle | The set of natural, repeating processes that form, change, break down, and re-form rocks |
| Intrusive rock | Igneous rock that forms as magma cools below Earth’s surface |
| Extrusive rock | Igneous rock that forms as lava cools on Earth’s surface |
| Sediment | Solid materials such as rock fragments, plant and animal remains, or minerals that are carried by water or by air and that settle on the bottom of a body of water or on the ground |
| 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 |
