Acid rocks have . . . . . . . . silica.

A. 40 - 55%

B. 55 - 65%

C. 65 - 70%

D. 85 - 90%

Answer: Option C

Solution(By Examveda Team)

Acid rocks refer to the chemical composition of igneous rocks that has a large percentage of silica content.
Acid rocks have 65 - 70 % of silica and usually contain more than 20% of free quartz.
Typical acid rocks are granite and rhyolite.