Moon: Properties, Composition, Surface and Rotation

It is the Earth's only natural satellite and has a gravity 1/6th that of the Earth.

This orbital period of the moon is synchronized with its rotational period. This phenomenon is known as ________________.

These are part of the lunar surface which are large, dark, smooth plains of basaltic rock created by ancient volcanic eruptions.

These lunar regions are older, more heavily cratered regions composed mainly of anorthosite - a type of rock rich in feldspar. They are light in color, and mountainous.

These parts of the lunar surface are depressions formed by the impact of meteoroids, comets, and asteroids. They also dominate the Moon's surface.

These includes debris ejected during the formation of an impact crater. They are distributed outward from the crater's rim onto the surface as debris, which thins at the outermost regions.

These are meandering channel-like structures thought to be the result of ancient lava flows or tectonic activity.

These are broad sunken blocks of crust bounded by fault lines. They are formed when the crust is stretched, breaks and drops down along two bounding faults, creating a trough or valley.

The synchronous rotation results in the same side of the Moon always facing Earth, a phenomenon known as _______________.

If the moon orbits the Earth in 27.3 days, how long does the moon rotate once on its axis.

• 27 days

• 27.3 days

• 23 days

• 33.7 days