Waves, Currents, Tides

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Across
  1. 2. What does a wave do as it approaches shore?
  2. 3. Periodic rise and fall of water
  3. 5. What is a group of bats called?
  4. 7. Name the effect of wind/water bending
  5. 9. What hockey great wore the number 68 to commemorate the Prague Spring of 1968?
  6. 10. Highest portion of a wave
  7. 11. Lowest portion of a wave
  8. 13. Combined gravitational pull
  9. 16. How many times was Ross married in the show "Friends"
  10. 17. What is the most frequent cause of waves?
Down
  1. 1. Current in the upper 100 meters
  2. 4. Who did U.S. buy the Virgin Islands from?
  3. 6. When does cold, nutrient rich water comes up
  4. 8. What is the National sport of Canada?
  5. 11. What is it called when a bowler gets 3 strikes in a row?
  6. 12. Large,circular current of water
  7. 14. Opposing gravitational pull
  8. 15. What causes the tides?