Vicky's Birthday Crossword

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Across
  1. 3. Something that knocks your hat off
  2. 4. A branch of physics
  3. 7. Instrument involving 3 across
Down
  1. 1. Curses like a ______
  2. 2. An agreement
  3. 5. At home in the ice
  4. 6. Parachute fabric "Ripstop"