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20 Cards in this Set
- Front
- Back
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Rock
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a solid mixture of crystlas of one or more minerals
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The rock cycle
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the process by which one rock type changes into another
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Sedimentary rock
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rocks that are formed when sediments are compacted and cemented together.
weathering, erosion, and deposition lead to formation |
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Metamorphic rock
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formed when the texture and composition of preexisting rock is changed by heat or pressure deep underground
igneous and sedimentary can change into metamorphic |
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igneous rock
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forms from the cooling of magma
magma forms in the earth's lower crust and upper mantle |
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lava
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when magma flows out onto the earth's crust it is called lava
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rock classification
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based on composition and texture
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composition
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the minerals that make up the rock
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texture
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determined by the sizes, shapes and positionbs of the grains by whcih it is made
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fine-grained
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composed of small grains such as silt and clay
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medium-grained
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have a texture between coarse and fine-grained rock
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coarse-grained
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contain large grains the size of pebbles
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felsic rock
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igneous rock
lightwieght (less dense) and light in color |
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mafic rock
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igneous rock
denser and darker then felsic rock |
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intrusive rock
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igneous rock formation
forms when magma cools and solidifies beneath the earth's surface usually coarse-grained because it cools very slowly |
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plutons
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intrusive rock formation
large, balloon-shaped formations that result when magma cools at great depths |
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extrusive rock
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igneous rock formation
forms on earths surface cools quickly on surface |
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lave flow
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flow of lava emanating from anerupting volcano
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fissures
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long cracks in the earths surface
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lava plateau
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large amounts of lava emanating from a fissure can cover a vast area forming a plain called lava plateau
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