Planet Earth Quiz

What percentage of Earth's atmosphere is made up of oxygen?

• 50%

• 1%

• 21%

• 78%

How long does it take for Earth to complete one rotation, resulting in day and night?

• 12 hours

• 24 hours

• 48 hours

• 36 hours

Why is Earth referred to as the Goldilocks planet?

• It has extreme temperatures.

• It has conditions just right for life.

• It is the largest planet.

• It is closest to the sun.

What percentage of Earth's surface is covered by water?

• 70%

• 50%

• 30%

• 90%

Which planet is closest to the sun but not the hottest?

• Venus

• Mercury

• Earth

• Mars