science crossword puzzle

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Across
  1. 4. - Caused by the phases of the moon
  2. 7. -keeps us on the ground
  3. 10. - has a fixed shape
  4. 11. - something that causes seasons
  5. 12. - they are in the states of matter
Down
  1. 1. - doesn't have a fixed shape
  2. 2. -a community of interacting particles
  3. 3. - the thing that measures force
  4. 5. - the earth goes around the sun
  5. 6. - static
  6. 8. - attracts
  7. 9. - doesn't have a fixed shape