Pegmatites are composed of very large crystals that formed from water-rich magma.
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Q11: Partial melting explains the origin and composition
Q12: Magmas formed at subduction zones are mostly
Q13: Phaneritic textures indicate that the rock formed
Q14: Porphyritic textures suggest a complex cooling and
Q15: Volcanoes always erupt magmas of the same
Q17: Rhyolite forms when a mafic magma cools
Q18: Dikes are concordant and sills are discordant.
Q19: Laccoliths are more similar to sills than
Q20: Most batholiths are emplaced by the process
Q21: Geologists generally agree that batholiths are emplaced
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