http://en.wikipedia.org/wiki/Volcano
volcanoes can be composed of a variety of igneous rocks.
No. Shield volcanoes have gentle slopes composed almost entirely of cooled lava flows.
No. Plutonic rocks are igneous rocks that hardened underground. Rocks that form on volcanoes are volcanic rocks.
Because the lava from volcanoes form igneous rocks
Igneous Rocks.
igneous rocks,sedimentary rocks, and metamorphic rocks.
Rocks are composed of minerals which are composed of elements.
Rocks formed in volcanoes from magma.
Igneous rock is found in volcanoes.
TThe magma is composed of gas and is silica rich.
Rocks are composed of minerals. Minerals are composed of elements.
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The plural possessive form of "volcanoes" is "volcanoes'".