Q763
Acid rocks have . . . . . . . . silica.
A.
40 - 55%
B.
55 - 65%
C.
65 - 70%
AnswerD.
85 - 90%
Answer: Option C
Solution
Answer: Option C
Solution:
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.