ISB Crossword - Winter edition

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