Rocks containing more than 65% SiO2 are
A. Neutral
B. Alkaline
C. Acidic
D. None of these
Answer: Option C
Solution(By Examveda Team)
Rocks containing more than 65% SiO2 are acidic.Rocks with more than 65% of silica are called Felsic or acidic, those with between 55 and 65 percent silica are intermediate, and those with between 45 - 55% silica are mafic (Basic) and those with less than 45% are ultramafic.
Acidic magma solidifies in the crust commonly as granite and erupts as rhyolite lavas. Within an intrusion, crystals grow large within the magma chamber.
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