How the World Works - Systems Edition

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Across
  1. 4. A force that pulls things toward each other.
  2. 7. A part of a system.
  3. 12. When two or more things affect each other.
  4. 13. Caused by the Earth's rotation.
  5. 14. A natural object that orbits a planet.
Down
  1. 1. A group of parts that work together.
  2. 2. What something does or how it works.
  3. 3. When something spins on its own axis.
  4. 5. When something moves around another object.
  5. 6. A large object that moves around a star (like the Sun.
  6. 8. An invisible line something spins around.
  7. 9. A star at the center of our solar system.
  8. 10. The path something takes as it goes around something else.
  9. 11. Changes in weather and daylight caused by Earth's tilt and revolution.