unit 5

5. system: The system consisting of the sun and the planets and other objects that revolve around it.
7. tide: The tide with the greatest difference between consecutive low and high tides
8. forces: the fundamental force of attraction between any two objects with mass or energy.
9. The attractive force between objects; the force that moves objects downhill
11. the movement of an object around another object.
14. the state in which one object's distance from another is changing.
15. tide: A tide with the least difference between consecutive low and high tides.

1. of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to the sun.
2. A push or pull.
3. A large, gaseous body at the center of the solar system
4. The planet on which we live; the world
6. tide: The periodic rise and fall of sea level.
7. A set of things that work together as parts of a mechanism or a interconnecting network
10. orbit: an oval shaped path, like a slightly elongated circle
12. the path of an object as it revolves around another object in space.
13. the spinning motion of a planet on its axis