Geography · Geomorphology and Petrology
Assertion [A]: Obsidian is an extrusive volcanic igneous rock. Reason [R]: Lava or magma cooling extremely rapidly at or near Earth's surface leaves little to no time for crystal formation, producing natural volcanic glass.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1[A] is false but [R] is true
- 2[A] is true but [R] is false
- 3Both [A] and [R] are true but [R] is not the correct explanation of [A]
- 4Both [A] and [R] are true and [R] is the correct explanation of [A]✓
Correct answer
Both [A] and [R] are true and [R] is the correct explanation of [A]
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