Q104
Igneous rocks are said to be acidic when they contain high proportion of ________
A.
Iron
B.
Magnesium
C.
Silica
AnswerD.
Aluminium
Answer: Option C
Solution
Answer: Option C
Solution:
When Igneous rocks contain high proportion of silica, they are acidic. Acid igneous rocks such as granite are less dense and have lighter colour than basic igneous rocks.