| A | B |
|---|
| organic | substances are composed of matter that is alive or was once alive |
| inorganic | substances that were never alive |
| mineral | a naturally occurring inorganic substance with a certain chemical composition and set of physical properties |
| rock | a naturally occuring solid made of two or more minerals |
| crystal | a solid sustance with a regualr shape. A crystal has symmetrical plane faces |
| grain | the smallest piece of mineral in a rock |
| igneous rocks | rocks formed from cooled lava or magma |
| intrusive | igneous rocks formed from magma inside the earth. Intrusive igneous rocks have large crystals |
| extrusive | ignous rocks formed from magma inside the earth. Intrusive igneous rocks have large crystals. |
| sedimentary rocks | rocks formed from the weathering, erosion and deposition of materials in a body of water |
| weathering | process by which wind, water and ice wear down |
| erosion | movement of sediment by wind, water, ice or gravity |
| deposition | process by which wind, water, and gravity leave eroded sediments in new locations |
| lava | molten rock material pushed up form a volcano or crack |
| magma | molten rock beneath the Earth's surface |
| metamorphic rock | rocks that have been changed by heat and pressure |
| rock cycle | process by which rocks change over time into other types of rocks |
| hardness | ability of a mineral to resist scratching |
| luster | how the surface of a mineral appears when it reflects light |
| cleavage | splitting of minerals along flat surfaces |
| streak | color of a mineral in powder form |
