A weather balloon project.

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Across
  1. 2. How hot or cold something is (11 letters)
  2. 4. School work you make or do (8 letters)
  3. 6. To send something into the air or space (8 letters)
Down
  1. 1. How many people see a video (5 letters)
  2. 3. Put a photo or video online (6 letters)
  3. 5. To write something down (6 letters)