What three groups are rocks divided into according to the conditions of their formation?

Scientists divide rocks by origin into three main groups. The first of them includes rocks that were formed as a result of volcanic eruptions and are called volcanic. These are granite and basalt. The second group includes sedimentary rocks that were formed from the remains of ancient animals or plants, such as limestone or coal. The rocks of these two groups decay over time under the influence of water, and their particles form new materials, which are called metamorphic (third group).

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