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Volcanic rock is igneous. This is because rock that forms fromt the cooling of molten material is the very definition of igneous rock.

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Is sulfur igneous metamorphic or sedimentary?

Sulfur is not classified as igneous, metamorphic, or sedimentary. Instead, it is an element that can be found in various rock types originating from volcanic activities, hydrothermal deposits, and sedimentary rocks where organic matter has been buried and transformed.


Is graphite igneous sedimentary or metamorphic?

Graphite is a metamorphic rock. It is formed from the metamorphism of organic sedimentary rocks, such as coal, under high temperature and pressure.


Is opal a sedimentary igneous and metamorphic rock?

Opal is neither a sedimentary, igneous, nor metamorphic rock. It is actually a mineraloid composed of hydrated silica that is formed from silica-rich solutions at low temperature, often found in sedimentary rocks like sandstone or volcanic areas.


Does a rock go through the complete rock cycle by changing from igneous rock to sedimentary to metamorphic?

Yes, it can. However, an igneous rock can change to a metamorphic rock skipping sedimentary: the tectonic plates can push igneous rock deep into the ground, forming metamorphic rock. Sedimentary can form metamorphic, metamorphic can form magma or lava by melting and/or erupting and then turn into igneous. Igneous forms sedimentary with erosion, deposition compaction, and cementation.


Is breccia a sedimentary metamorphic or igneous rock?

Yes. In the rock cycle, any sedimentary rock can be transformed into a metamorphic rock due to deep burial where the rock is changed by the earth's high temperature and pressure, an exposure to a plutonic intrusion, where rocks such as granite are formed, or any other process where heat and pressure alter the composition, appearance, and classification of a rock. An igneous rock can turn into a metamorphic rock or a sedimentary rock. A metamorphic rock can turn into an igneous rock or a sedimentary rock, and a sedimentary rock can turn into an igneous rock or a metamorphic rock.