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Rock Basics
Rocks & Minerals Information and The Rock Cycle
Term | Definition |
---|---|
Minerals | Rocks are made from these natural nonliving solid crystals . |
Cenozoic | The most recent period of the Geologic Time Scale |
Hardness | The property of rocks that describes how easily it can be scratched by another rock |
Streak | The property of rocks that is the color of the powder that it leaves when it is scratched against a special plate |
Diamond | The hardest rock on the MOH's Scale for hardness |
Talc | The softest rock on the MOH's Scale for hardness |
Erosion | The process where water, ice, wind, and/or gravity carries bits of rock, soil, shells, and dead organism materials from one place to another |
Sediments | Eroded materials that settle on land or at the bottom of waterways, including lakes, river, or oceans |
Sedimentary Rocks | Rocks formed when sediments are cemented together by pressure and clay materials, then harden |
Fossils | The remains of living things that are found in sedimentary rocks |
Magma | Partially melted rock UNDER the Earth's crust |
Pumice | The type of igneous rock formed with many airholes, allowing it to float on water |
Igneous Rocks | Rocks that are formed from cooled lava |
Metamorphic Rocks | The type of rocks that have been changed completely as a result of heat and pressure |
Rock Cycle | The ongoing process that changes one type of rock into another |
Shale | The sedimentary rock from which the metamorphic rock slate may be formed |
Limestone | The sedimentary rock from which the metamorphic rock marble may be formed |
Quartz | The igneous rock from which the metamorphic rock gneiss may be formed |
Precambrian | The oldest period of the Geologic Time Scale |
Luster | The property of rocks that describes the way it reflects light |