What causes day and night on Earth?

• The Earth spinning on its axis.

• The Earth moving around the sun.

• The moon blocking the sun.

• Clouds covering the sun.

What is unique about the Earth's axis?

• It is tilted.

• It is perfectly straight.

• It changes its angle often.

• It is invisible.

In June, how long are the days in the Northern Hemisphere?

• Longer than 12 hours.

• Shorter than 12 hours.

• Exactly 12 hours.

• Always dark.

In December, how long are the days in the Northern Hemisphere?

• Longer than 12 hours.

• Shorter than 12 hours.

• Exactly 12 hours.

• Always bright.