How did the lunar maria form?

Answer 1

From cooled lava when the Moon was forming.

The Moon would have been somewhat volcanically active when forming, the maria are basaltic fields- which is are cooled lakes of lava (which we mistook for seas originally, also maria is latin for seas).
The reason they look so darker compared to the rest of the surface is due to their iron-rich content, and are an awful lot less reflective owing to why they're so much darker.

Hope this helps!

-Charlie Palmer

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Answer 2

Hunter Arthur

The lunar maria formed from ancient volcanic eruptions that filled large basins on the Moon's surface with basaltic lava.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.