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Extrusive rock
refers to the mode of
igneous volcanic rock
formation in
which hot
magma from
inside the
Earth flows out (extrudes) onto the
surface as...
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occurs either below the
surface as
intrusive rocks or on the
surface as
extrusive rocks.
Igneous rock may form with
crystallization to form granular, crystalline...
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igneous rock type
similar to
granite Basalt – Magnesium- and iron-rich
extrusive igneous rock ʻAʻā –
Molten rock
expelled by a
volcano during an eruptionPages...
- Volcanism, vulcanism, volcanicity, or
volcanic activity is the
phenomenon where solids, liquids, gases, and
their mixtures erupt to the
surface of a solid-surface...
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vesicles (pores from gas
bubbles in lava) of a
volcanic rock or
other extrusive igneous rock are
infilled with a
secondary mineral, such as calcite, quartz...
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mineral crystals, with the
larger crystals known as phenocrysts. Both
extrusive and
intrusive rocks can be porphyritic,
meaning all
types of
igneous rocks...
- ****emblage is
predominantly quartz, sanidine, and plagioclase. It is the
extrusive equivalent of granite. Its high
silica content makes rhyolitic magma extremely...
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within the
crust of the planet. In contrast, an
extrusion consists of
extrusive rock,
formed above the
surface of the crust. Some
geologists use the term...
- /ˈbæsɔːlt, -əlt/; US: /bəˈsɔːlt, ˈbeɪsɔːlt/) is an
aphanitic (fine-grained)
extrusive igneous rock
formed from the
rapid cooling of low-viscosity lava rich...
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Phonolite is an
uncommon shallow intrusive or
extrusive rock, of
intermediate chemical composition between felsic and mafic, with
texture ranging from...
