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McC 8 Rocks
McC Rocks
Question | Answer |
---|---|
rock | a mixture of minerals, volcanic glass, organic matter, and other materials |
rock cycle | a model that illustrates the processes that create and change rock |
principle of conservation of matter | the fact that illustrates that changes in the rock cycle never creates nor destroys matter |
igneous rock | type of rock formed when magma cools and hardens |
lava | magma that reaches the Earth's surface and flows from volcanoes |
magma | melted or molten rock |
intrusive | rocks that form from magma below the surface of the Earth |
extrusive | rocks that cool on or near the Earth's surface |
basaltic | dense, darkly colored rocks that are rich in iron and magnesium, but poor in silica |
granitic | lighter colored rocks of lower density; contains more silica and less iron and magnesium |
metamorphic rock | rocks that have been tranformed through heat, pressure and the presence of hot-watery fluids |
foliated | mineral grains that flatten and line up in parallel layers |
nonfoliated | mineral grains that grow and rearrange but do not line up in layers |
sediment | loose materials such as rock fragments, mineral grains, bits of plant and animal remains that have been moved by wind, water, ice or gravity |
sedimentary rock | rocks that form when sediments are pressed and cemented together or when minerals form from solutions |
compaction | process by which layer upon layer of sediment creates pressure, pushing the layers to form rocks |
cementation | the process by which water soaks through rock and soil and forms solution that moves through open spaces between sediments |
weathering | the prcoess by which rocks are broken into smaller pieces |
erosion | the process by which sediments are moved to new locations |
coal | useful organic sedimentary rock formed from pieces of dead plants buried under swamp sediments |