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They are Seas. A long time ago when the Moon's core was still active, hot lava would rise from inside the Moon and fill these giant craters (they were called basins back before they were filled with lava). We of course call them seas today because, go figure, some kind of liquid filled them up (lava).

So they were basins before they were filled with lava and now they are called Seas because they were filled up.

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The dark smooth plains on the moon are called?

The dark smooth plains on the moon are called lunar maria. They are vast, flat areas formed by ancient volcanic activity. Maria is the Latin word for "seas," as they were once believed to be bodies of water.


Dark areas on the moon that are smooth and that reflect little light are called?

The dark areas on the moon that are smooth and reflect little light are called maria. They are large basaltic plains formed by ancient volcanic activity on the moon's surface.


Where are seas on the moon?

There are no seas on the moon. The moon's surface is mostly covered by craters, mountains, and plains, but no bodies of water like seas or oceans. The dark areas on the moon that look smooth from Earth are actually large plains of solidified lava called maria.


What does maria means?

this means that there is a preferably dark spot on the moon or seas of the moon or plains on the moon


What is a moons maria?

Maria is a bunch of Basaltic material (which is igneous rock) that came together on the moon. It formed when the moon cooled. People used to think that the dark spots (maria) on the moon were oceans.


These are broad flat lava plains on the moon?

They are called lunar maria, formed by ancient volcanic eruptions that flooded the surface with basaltic lava. These smooth, dark areas contrast with the rugged, bright highlands on the moon.


What did the Maria on the moon form from?

The Maria on the moon was formed from lava/magma.


What is another name for the ancient lava flows on the Moon?

The ancient lava flows on the Moon are often referred to as lunar maria. These features are dark, smooth plains created by volcanic activity early in the Moon's history.


Galileo called the dark flat parts on the moon what?

Galileo called the dark flat parts on the moon "seas" or "maria" in Latin, although they are now known to be basaltic plains formed by ancient volcanic activity.


Where are the dark plains called the ocean of storms?

moon


What was formed when lava flowed over Moon's surface?

When lava flowed over the Moon's surface, it formed vast plains known as maria. These are flat, dark areas that were created by ancient volcanic activity on the Moon. The lava flows filled in large impact basins, creating the smooth, dark patches we see on the lunar surface.


What different surfaces does the moon have?

The moon has plains,mountains,and many craters. The moon also has unactive volcanoes and dark spots called seas.