What is the primary characteristic that distinguishes an intrusive igneous rock from an extrusive igneous rock?

Practice MCQ for SSC, UPSC, RRB Exams

A. Its density A.
B. Its resistance to weathering B.
C. The size of its mineral crystals C.
D. Colour D.

Correct Answer: C সঠিক উত্তর: C

Explanation ব্যাখ্যা

Intrusive rocks cool slowly underground, forming large, visible crystals (phaneritic), while extrusive rocks cool quickly on the surface, forming small or invisible crystals (aphanitic).

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