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What type of rock is formed when molten material cools and solidifies?

  1. Sedimentary

  2. Metamorphic

  3. Magma

  4. Igneous

The correct answer is: Igneous

When molten material, also known as magma, cools and solidifies, it forms an igneous rock. Sedimentary rocks are formed through the accumulation and compression of sediments, while metamorphic rocks are formed from the alteration of existing rocks due to extreme heat and pressure. Therefore, options A and B are incorrect. Option C, magma, is the molten material itself and not the type of rock that is formed when it cools. Therefore, option D, igneous, is the correct answer.