Which of the following is a metamorphic rock?

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Multiple Choice

Which of the following is a metamorphic rock?

Explanation:
Metamorphic rocks form from existing rocks that are transformed by heat and pressure, causing minerals to recrystallize and often realign into new textures. Marble is formed when limestone is subjected to enough heat and pressure to recrystallize its calcite minerals, creating the interlocking crystal texture that characterizes marble. The other options come from cooling molten rock or rapid cooling of lava: granite and basalt are igneous rocks formed from magma cooling, and obsidian is volcanic glass formed when lava cools extremely quickly. That combination makes marble the metamorphic rock in the list.

Metamorphic rocks form from existing rocks that are transformed by heat and pressure, causing minerals to recrystallize and often realign into new textures. Marble is formed when limestone is subjected to enough heat and pressure to recrystallize its calcite minerals, creating the interlocking crystal texture that characterizes marble. The other options come from cooling molten rock or rapid cooling of lava: granite and basalt are igneous rocks formed from magma cooling, and obsidian is volcanic glass formed when lava cools extremely quickly. That combination makes marble the metamorphic rock in the list.

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