science crossword puzzle

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Across
  1. 4. when the moon goes around the sun
  2. 6. the things in the state of matter
  3. 8. the thing that keeps us on the ground
  4. 10. the consist of all the food chains in a single organsim
  5. 11. what force is measured
  6. 13. the system of who animal prey and pretatdor Is
  7. 15. has a fix shape state of matter
Down
  1. 1. when there two surfaces rubbing against each other making
  2. 2. something that the axial tilt causes
  3. 3. doesn't have a fix shape state of matter moves fast
  4. 5. field something we cant see that to do with magnets
  5. 7. are something that happens to the water with the gravitational pull of the moon
  6. 9. something that causes seasons
  7. 12. community of interacting particles
  8. 14. state of matter doesn't have a fix shape