[[Image:North america rock types.jpg|thumb|100px|right|:Image:North america rock sedimentary.jpg, :Image:North america rock volcanic.jpg, :Image:North america rock plutonic.jpg, :Image:North america rock metamorphic.jpg rock types of North America. ]] Rock is a naturally occurring aggregate of minerals and/or mineraloids. Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them. Rocks are thus separated into igneous rock, sedimentary rock, and metamorphic rock rocks. Igneous rocks are formed from molten magma, and are divided into two main categories: Plutonic rock and Volcanic rock. ''Plutonic rock'' results when the magma cools and crystallises slowly within the Earth's crust, while ''Volcanic rock'' result for the magma reaching the surface either as lava or fragmental ejecta. Sedimentary rocks are formed by deposition of either detrital or organic matter, or chemical precipitates (evaporite), followed by compaction of the particulate matter and cementation. The latter can occur at or near the earth's surface, especially in the case of carbonate-rich sediments. Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. The metamorphic-rock-forming PT conditions are always higher than those at the earth's surface, and are sufficiently high enough to change the original mineralogy to either other minerals or to other forms of the same minerals (e.g. by recrystallisation). The Earth's crust (including the lithosphere), and the Earth's mantle are formed of rock. == See also == * Geology * Petrology * List of rocks * List of minerals * List of stone * Quarrying * Rock formations * Megalith ==Links== [http://www.geol.lsu.edu/henry/Geology3041/2IgneousClassify/IgneousClassFlow.htm Classification of Igneous Rocks] ----- Geology Materials ms:Batu
"Stone" is missing a disambiguation page. There's also a unit of mass named "stone" (14 lbs, ~6.35 kg). The 1st two sentences seem to contradict. Are rocks classified by their composition, or the process that formed them. I'm sure a geologist could find a way to word this better.User:Ike9898 01:34, Jan 12, 2005 (UTC)
See other meanings of words starting from letter:
Words begining with Rock_(geology):
Rock_(geology)
Rock_(geology)
Rock (geology)
[[Image:North america rock types.jpg|thumb|100px|right|:Image:North america rock sedimentary.jpg, :Image:North america rock volcanic.jpg, :Image:North america rock plutonic.jpg, :Image:North america rock metamorphic.jpg rock types of North America. ]] Rock is a naturally occurring aggregate of minerals and/or mineraloids. Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them. Rocks are thus separated into igneous rock, sedimentary rock, and metamorphic rock rocks. Igneous rocks are formed from molten magma, and are divided into two main categories: Plutonic rock and Volcanic rock. ''Plutonic rock'' results when the magma cools and crystallises slowly within the Earth's crust, while ''Volcanic rock'' result for the magma reaching the surface either as lava or fragmental ejecta. Sedimentary rocks are formed by deposition of either detrital or organic matter, or chemical precipitates (evaporite), followed by compaction of the particulate matter and cementation. The latter can occur at or near the earth's surface, especially in the case of carbonate-rich sediments. Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed. The metamorphic-rock-forming PT conditions are always higher than those at the earth's surface, and are sufficiently high enough to change the original mineralogy to either other minerals or to other forms of the same minerals (e.g. by recrystallisation). The Earth's crust (including the lithosphere), and the Earth's mantle are formed of rock. == See also == * Geology * Petrology * List of rocks * List of minerals * List of stone * Quarrying * Rock formations * Megalith ==Links== [http://www.geol.lsu.edu/henry/Geology3041/2IgneousClassify/IgneousClassFlow.htm Classification of Igneous Rocks] ----- Geology Materials ms:Batu
Rock (geology)
"Stone" is missing a disambiguation page. There's also a unit of mass named "stone" (14 lbs, ~6.35 kg). The 1st two sentences seem to contradict. Are rocks classified by their composition, or the process that formed them. I'm sure a geologist could find a way to word this better.User:Ike9898 01:34, Jan 12, 2005 (UTC)
See other meanings of words starting from letter:
R
RA | RB | RC | RD | RE | RF | RG | RH | RI | RJ | RK | RL | RM | RN | RO | RP | RS | RT | RU | RW | RX | RY | RZ |Words begining with Rock_(geology):
Rock_(geology)
Rock_(geology)
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