| A | B |
|---|
| Mineral | A naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition. |
| Metamorphic | Heat and pressure deep beneath Earth’s surface can change any rock into this type of rock. |
| Geode | rounded, hollow rock that is often lined with mineral crystals. |
| Extrusive | igneous rock that is formed from lava that erupted onto the surface. |
| Luster | The term used to describe how light is reflected from a mineral’s surface. |
| Crystal | The atoms of a mineral are arranged in a repeating pattern to form a solid called this. |
| Compaction | The process that presses sediments together |
| Erosion | The carrying away of rock fragments by water, wind or ice. |
| Cementation | Dissolved minerals and particles of sediment stick together to form sedimentary rock in this process. |
| Igneous | Type of rock that forms when lava or magma cool. |
| Deposition | The process by which sediment settles out of the water or wind carrying it. |
| Foliated | Term for metamorphic rocks that have thin flat layers (bands). |
| Streak | The color of a mineral’s powder is called this. |
| Basalt | This igneous rock is dark colored and has a lower silica content. (Its mineral crystals are too small to be seen.) |
| Rock Cycle | a series of processes that slowly change rocks from one kind to another kind. |
