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the material on the moon is typically called moon dust but I am not sure what the official name is. it consisted of smooth particles not found on the earth's surface.
These dark areas are called maria. They are thought to be formed by volcanic eruptions in the moon's history.
Maria isn't a name of a moon, though it's what the dark areas on our own moon are called which were once though to be seas.
Galileo Galilei
He claimed the Moon was not smooth-surfaced, but uneven and rough.
maria
Actually, the moon slowly rotates, so there isn't a low part, but it is coincidental
The moons smooth parts are called Maria
the light areas of the moon are called the highlands. the dark areas are called maria.
maria
The phases of the moon
The Moon is still called a lunar MARE.
terrae
Craters
maria
craters
The visible surface of the moon is divided into lighter and darker areas. The darker areas are called "Maria," which is the plural of the Latin word for "sea" (mare). These areas are vast lunar plains, and aren't literally seas, as they exist on earth.