| A | B |
|---|
| The path Earth takes as it moves around the Sun is its ____. | Orbit |
| How long does it take for Earth to make one complete revolution? | One year |
| What is a revolution? | One full orbit around another object |
| How long does it take for the Earth to make one complete rotation? | 24 hours (one day) |
| What causes the Earth to orbit the Sun? What causes the Moon to orbit the Earth? | Gravity |
| How far is the Earth from the Sun? | 93 million miles (150 million kilometers) |
| How much of the Earth's surface is covered by water? | About 70% |
| Why so we have seasons? | The tilt of the Earth's axis during its revolution around the Sun |
| The phases of the Moon appear in a pattern that repeats itself every _____ days. | 29 1/3 days |
| Why does the Moon seem to change shape? | It depends on how much of the sunlit half of the Moon is facing Earth, which depends on the position of the Moon in its orbit around the Earth. |
| Describe a solar eclipse. | When the moon moves directly between the Sun and Earth so that all three are lined up in a straight line |
| Describe a lunar eclipse. | When the Earth passes between the sun and the moon. |
