| Assertion [A]: Granite has larger crystals than basalt. |
| Reason [R]: Basalt has larger content of metallic minerals |
A) Both A and R are true and R Explains A
B) Both A and R are true but R does not explain
C) A is true but R is false
D) A is false but R is true
Correct Answer: B
Solution :
The crystal size in the igneous rocks is more a function of the quickness of the process of cooling rather than of the mineral content. The mineral content determines the melting point of the rocks and the basaltic lava having a higher content of metallic minerals solidifies rapidly once it reaches the surface.
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