Midterm Review

1. this is the force that keeps the same side of the moon facing Earth
4. the force of gravity in the solar system makes Earth and other Planets orbit around this
5. the moon is visible on Earth because it reflects
6. when the moon comes directly between the sun and the Earth
7. Earths orbit around the Sun one year
9. a large object struck Earth and the ejected material from the collision combines
11. helps prevent injuries in cars because it applies force in the opposite direct as the passenger motion
12. the different appearances of the moon on Earth
13. first step in the scientific method is this question to be answered in an experiment
14. feature that causes seasons on Earth
16. when neither end of the axis is tilted away from the Sun equal hours of daylight and darkness
18. this is what causes night and day on Earth

2. these are small planets with rocky surfaces
3. when Earth's shadow falls on the moon
8. a statement made using your 5 senses
10. these planets are much larger than Earth, and are made mainly of hydrogen and helium
15. a body in motion will remain in motion unless influenced by an outside force
17. Earth is located in one of these in the universe