Prefix crossword puzzle

12345678910
Across
  1. 3. A machine that goes to the bottom of the ocean.
  2. 6. Like a stamp on a letter.
  3. 7. A three-sided shape.
  4. 8. To not agree with something.
  5. 9. A contraption with two wheels.
  6. 10. to leave
Down
  1. 1. togetherness.
  2. 2. To be ready for something.
  3. 4. A hero with special powers.
  4. 5. to pay for something.