| A | B |
|---|
| rock | a solid that is usually made of two or more minerals |
| ore | a mineral that contains something that can be useful and sold for a profit. |
| crystal | a solid mineral with repeating patterns of atoms. |
| rock cycle | a diagram that shows the process of how rocks are changed from one type to another. |
| gem | a mineral that is rare and can be cut and polished, giving it a beautiful appearance. |
| extrusive | rocks that form when lava cools on Earth's surface. |
| intrusive | igneous rocks that form below the surface of the Earth. |
| igneous rocks | include intrusive and extrusive kinds of rocks. |
| detrital | rocks made of grains of minerals or other rocks that are moved and deposited into layers. |
| chemical | rocks formed when seawater, loaded with dissolved minerals, evaporates |
| sedimentary rocks | include detrital, chemical, and organic kinds of rocks. |
| Organic | rocks formed over millions of years from living matter. |
| metamorphic rocks | include foliated and nonfoliated kinds of rocks. |
| foliated | rocks with bands of minerals that have been heated and squeezed into parallel layers. |
| nonfoliated | metamorphic rocks with no distinct layers or bands. |
| mineral | an inorganic, solid material found in nature. |
| physical property | any characteristic of a material that you can observe without changing the identity of the material. |
| lava | molten rock material that exists at or above the Earth's surface. |
| pressure | force applied over a given area. |
