An ________ is an imaginary line through the center of an object.

As Earth ________ , only the side of the Earth facing the sun has sunlight.

Because Earth ________, the sun appears to move across the sky.

Earth's ________ is tilted.

As Earth ________ around the sun, different parts of Earth are tilted toward the sun.

Earth's axis passes through the ________.

The length of day and night stays the same during the year.

In December, places south of the Equator have more hours of light and longer days.

A ________ is any object that revolves around a planet.

All of the Moon's sunlit side is a ________ which looks round and bright.

It is ________when you cannot see any part of the Moon's sunlit side.

A bowl-shaped dent in the surface of the moon is a ________.

The light that shines from the Moon is reflected from the ________.

The Moon is a satellite of Earth because it ________ around Earth.

Just like Earth, the moon ________ on its axis.

Throughout the month, the moon has different ________.

Because the moon is smaller than Earth, the Moon's ________ is weaker than Earth's

The phase of the moon shown here is ________.

The phase of the moon shown here is ________.