The included document contains directions for a crossword puzzle review game, an empty crossword puzzle, and separate clues. This lesson takes the traditional crossword puzzle pastime and turns it from an individual activity into a classroom review game. Teams compete to answer clues read by the teacher and fill in their crossword. Students can review key vocabulary terms and their definitions. This particular puzzle closely correlates with words found in the HOLT Earth Science textbook, Chapter 19 & 20 on ocean water. Please check my page for other chapters!