| Term | Definition |
|---|
| rock | the hard material that composes the earth's crust |
| igneous | rock that forms when molten rock solidifies |
| intrusive rock | magma that remains in pockets below the surface and slowly cools and hardens while still underground , forming this |
| extrusive rocks | a rock that has a fine-grained appearance |
| granite | some of this rock can be seenon the earth's surface and can be found most everywhere on earth |
| sedimentary | over seventy-five percent of the earth's surface is covered with this |
| sandstone | used for making glass |
| conglomerate | consists of pebbles embedded in hardened sand or clay |
| halite | mined for flavoring food and for making chemical |
| metamorphic | changed by extreme heat or pressure |
| slate | a weather -resistant waterproof rock it begins as shale, and has leaflike layers |
| marble | a rock that was once limestone but was hardened by extreme heat and withstands weathering better than any other rock |
| gemstones | igneous and metamorphic crystals |
| precious stones | the rarest most durable and beautiful gems |
| diamond | the hardest of all known minerals |
| iron | the most commonly used metal |
| copper | a good conductor of electricity |
| ore | any rock that contains impurities |
| anthracite | a hard shiny black coal |
| bituminous | the most common type of coal |
| lignite | also called brown coal |
| potroleum | a thick flammable liquid that has a dark color and sometimes gives off an unpleasant odor |
| cave | any hollow space in the earths crust that has formed naturally and is large enough for a person to enter |
| speleology | the study of caves |
| solution cave | a cave formed by the dissolving of underground rocks by water |
| trogloxenes | visit caves regularly but cannot live there for long periods they must always return to the surface to find food |
| troglophiles | also called cave lovers |
| magnetic field | the area surrounding a magnet in which the force of magnetism affects other objects |
| poles | the places of a magnetwhere the magnetic field is most concentrated |
| magnetosphere | the region of space affected by the earth's magnetic field |
Combine with other sets
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