Winter crossword

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Across
  1. 2. circle eats pie
  2. 7. 4.5 km circle
  3. 8. push on plunger is constant according to Charles
  4. 9. Fundamentally the best (2words)
  5. 11. direction of snow ball fight
  6. 13. Sliding down a slope
  7. 17. mom nut me confused when moving
  8. 18. Was it an apple?
  9. 19. Thumb First second generator (2words)
  10. 22. Use thumb and forefinger to apply pressure on imperial unit
  11. 27. found by chance
  12. 30. impossible to get to 100%
  13. 31. standard get cheesy
Down
  1. 1. Ancient Greek wanderer
  2. 3. the first invention given canada strength endured
  3. 4. 18 wheeler names light
  4. 5. Confused Ivy sitter is electrical
  5. 6. Confused skydiving loafer ran at Texas (2words)
  6. 10. it's square is itself
  7. 12. You gain when you go up the mountain (2words)
  8. 14. an electromagnetic lions ode
  9. 15. Think IB
  10. 16. High and low make a choir sing
  11. 20. Fundamental graph orb gets confused with rarer (2words)
  12. 21. fast graph has this area
  13. 23. it's reported to go faster than the speed of light
  14. 24. Electromagnetic sounds like glass used to magnify
  15. 25. he wasn't very certain
  16. 26. Pencil outside of school
  17. 28. Be nspired
  18. 29. I want to stay in bed