The moon is familiar as it rises in the night sky every night. However, upon closer inspection, there are unfamiliar traces. This is called the "seas of the moon," or maria. Maria means sea in Latin. Ancient astronomers named it this way because these traces resembled seas. It is not an actual sea. They are dark regions on the moon's near side. They formed from volcanic activity that occurred in the past on the moon. Faint traces left by volcanoes can be seen between the shadowy areas of the moon.
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