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igneous rocks that are dense and dark-colored thet form from magma that is rich in iron and magnesium and poor in silica

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Light colored silica rich ringeous rock than is less than dense than bacsaltical rock
User Oktieh
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light-colored, silica-rich igneous rock that is less dense than basaltic rock. dense, dark-colored igneous rock formed from magma;rich in magnesium and iron and poor in silica. Describes magma or igneous rock that is rich in feldspars and silica and that is generally light in color.

User Joshpetit
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