What are the large, dark, basaltic plains on the Moon, mistaken for seas by early astronomers, called?
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The dark areas on the Moon's surface are called maria, Latin for "seas," because early observers believed they were bodies of water. These vast plains are actually solidified basaltic lava flows from ancient volcanic eruptions, forming smooth, relatively crater-free surfaces. The lighter, heavily cratered areas are known as terrae or highlands.
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Source: Wikipedia (CC BY-SA)
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