Extrusive igneous rocks are typically fine grained because they crystallized slowly, deep below the Earth's surface.
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Q9: The geothermal gradient is the rate at
Q10: Pegmatites are extremely coarse-grained igneous rocks.
Q11: A dike is a discordant intrusive igneous
Q12: A mineral's melting point generally increases with
Q13: Lava is magma on the Earth's surface.
Q15: Igneous rock names are based on grain
Q16: Partial melting of the lower continental crust
Q17: Mafic igneous rocks are silica-poor.
Q18: Diorite and andesite are composed of similar
Q19: The continuous branch in Bowen's Reaction Series
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