| A | B |
|---|
| mineral | a solid element or compound found in nature, that has a definite chemical composition and crystal structure |
| luster | the way that the surface of a mineral looks when it reflects light |
| streak | the color of the powder left when a mineral is rubbed against a hard, rough surface |
| hardness | a measure of how easily a mineral can be scratched |
| cleavage | the tendency of a mineral to split along flat surfaces |
| ore | a mineral or rock that contains a useful substance |
| cementation | a process in which minerals, deposited as water evaporates, bind sediments into solid rock |
| rock | a naturally formed solid made up of one or more minerals that forms Earth’s crust |
| igneous rocks | a type of rock that forms from melted rock that cools and hardens |
| metamorphic rocks | a type of rock that forms from existing rocks because of changes caused by heat, pressure, or chemicals |
| sedimentary rocks | a type of rock that forms when sediments harden |
| sediments | small pieces of weathered rocks and minerals (also includes pieces of dead plants or animals) |
| fossil | the remains, imprints or traces of a living thing from the past preserved in rock |
| rock cycle | the continuous series of changes that rocks undergo |
