2026 · Q67
Which one among the following statements regarding igneous rock is correct ?
General KnowledgeGeography
- AWhen magma cools deep in the Earth's interior, it results in the formation of fine-grained igneous rocks.
- BBasalt is a type of intrusive igneous rock.
- CMost of the minerals of igneous rocks are silicates.
- DExtrusive igneous rocks often undergo lithification.
Explanation
Magma cooling deep underground cools slowly, forming coarse-grained (not fine-grained) igneous rocks, so option A is false. Basalt is an extrusive (volcanic) rock, not intrusive, so option B is false. Most igneous rock-forming minerals, such as quartz, feldspar, olivine, and pyroxene, are silicates (option C true). Extrusive rocks cool too quickly to undergo lithification, so option D is false.