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'''Igneous rocks''' are formed when molten [[rock]] is either ejected directly on to the earth's surface ([[extrusive rock]]) or pushed up near the surface and cools beneath it ([[intrusive rock]]). Molten rock beneath the earth's crust is called [[magma]]; when magma is ejected throught the crust it is called [[lava]].
'''Igneous rocks''' are formed when molten [[rock]] is either ejected directly on to the earth's surface ([[extrusive rock]]) or pushed up near the surface and cools beneath it ([[intrusive rock]]). Molten rock beneath the earth's crust is called [[magma]]; when magma is ejected through the crust it is called [[lava]].
Most igneous rocks are composed of an interlocking [[mosaic]] of [[crystal]]s. Lava rocks are often riddled with air holes.
Most igneous rocks are composed of an interlocking [[mosaic]] of [[crystal]]s. Lava rocks are often riddled with air holes.