Earth Moon Sun System POST-Test

Front

What phase of the Moon is observed during a New Moon?

Back

Not lit up at all.

Front

Why is a day 24 hours long?

Back

It takes the Earth 24 hours to spin once on its axis.

Front

What is the reason for having a 366th day every four years?

Back

It takes 365.25 days for Earth to revolve around the Sun.

Front

What does it mean when the Moon appears to be getting smaller?

Back

The Moon is Waning.

Front

What is the shape of Earth's orbit around the Sun?

Back

An oval shape called an ellipse.

Front

What is the term for the Moon phase when it is fully illuminated?

Back

Full Moon.

Front

What is the term for the Moon phase when it is increasing in illumination?

Back

Waxing.

Front

What is the term for the Moon phase when it is decreasing in illumination?

Back

Waning.

Front

How long does it take for the Moon to orbit the Earth?

Back

About 27.3 days.

Front

What causes the seasons on Earth?

Back

The tilt of the Earth's axis as it orbits the Sun.