| A | B |
|---|
| mineral | solid chemical matter that is formed in nature by earth's processes |
| crystal | the visible shape of a mineral's atom pattern |
| physical property | a characteristic that you can observe through your sense of sight, smell, taste, sound, or touch |
| hardness | measures how easily a mineral can be scratched |
| streak | the color of a mineral's powder |
| luster | a mineral's shine |
| geologist | scientist who studies Earth |
| rock | solid mixture of one or more minerals |
| three types of rocks | igneous, sedimentary, and metamorphic |
| igneous rocks | rocks formed from melted rock |
| magma | melted or molten rock inside Earth |
| intrusive igneous rock | igneous rock that cools slowly under the Earth's surface |
| extrusive igneous rock | rocks that form on the surface of Earth from lava |
| sedimentary rock | rock formed in cemented layers |
| metamorphic rock | rocks that change from one kind to another |
| ore | rocks containing valuable minerals |
