The maria, the dark regions of the Moon's surface, are approximately 1 billion years younger than the rest of its surface.

Name: The maria, the dark regions of the Moon's surface, are approximately 1 billion years younger than the rest of its surface.
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This is true. The maria are believed to have formed from lava flows that occurred about 3.5 to 1 billion years ago, while the rest of the Moon's surface is estimated to be about 4.5 billion years old.

The Maria, the Dark Regions of the Moon's Surface, Are