Question

when molten rock undergoes crystallization above ground, what type of rock results?
metamorphic rock
sedimentary rock
intrusive igneous rock
extrusive igneous rock

Explanation:

To determine the rock type formed when molten rock crystallizes above ground, we analyze each option:

• Metamorphic rocks form from existing rocks under heat/pressure, not molten rock crystallization.
• Sedimentary rocks form from sediment accumulation/cementation, not molten rock.
• Intrusive igneous rocks form from molten rock (magma) cooling below the Earth’s surface.
• Extrusive igneous rocks form when molten rock (lava) erupts onto the Earth’s surface and crystallizes there. Since the process here is crystallization above ground, this matches extrusive igneous rock formation.

Answer:

D. Extrusive igneous rock