Planet Crossword Puzzle

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Across
  1. 2. Belt / The circumstellar disc in the Solar System located roughly between the orbits of the planets Mars and Jupiter.
  2. 4. Force / A force that attracts any two objects with mass
  3. 5. / The outside part or uppermost layer of something
  4. 7. System / The collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
  5. 8. / The nature of something's ingredients or constituents; the way in which a whole or mixture is made up
  6. 9. / All existing matter and space considered as a whole
  7. 10. Planet / a giant planet composed mainly of elements heavier than hydrogen and helium, such as oxygen, carbon, nitrogen, and sulfur. There are two ice giants in the Solar System: Uranus and Neptune
Down
  1. 1. / The quality of not being harmful to the environment
  2. 3. Planet / A gas giant is a large planet composed mostly of gases, the gas giants of our solar system are Jupiter, Saturn, Uranus and Neptune
  3. 6. / The envelope of gases surrounding the earth or another planet