Math and science

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Across
  1. 3. Clear liquid we drink
  2. 6. Shape with four equal sides
  3. 9. Goes around the Earth
  4. 10. Split into equal parts
  5. 12. Form of something
  6. 13. Add numbers together
  7. 14. Hard natural material
  8. 15. Helps us see
  9. 16. Makes things warm
  10. 18. Round shape
Down
  1. 1. The number 0
  2. 2. One of two equal parts
  3. 4. Multiply numbers
  4. 5. Used for counting
  5. 6. Star at the center of our system
  6. 7. Take away
  7. 8. What we breathe
  8. 11. The planet we live on
  9. 13. Living thing that grows in soil
  10. 17. Living thing that can move