9. How can the name of formation of rock be put into two category with respect to igneous rock?
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Igneous rocks may be divided into two categories. Intrusive or plutonic rocks crystallize from magma beneath the earth's surface. Extrusive or volcanic rocks crystallize from lava at the earth's surface. Volcanic glass is called obsidian.
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The wavelength of a sound is the distance between adjacent identical parts of a wave—for
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