25 no-prep Crossword Puzzles for Earth Day - April 22. Celebrate Earth Day on April 22 with some worksheets, puzzles and activities. For our Earth Day activities, I wanted to give you the opportunity to introduce some important environmental topics and discussions into your classroom. So apart from some of the typical enviro terms, you'll find microplastics, packaging, restore, reduce, single use, solar, and hopefully a few other great ideas to spark your class. See Keywords (below) or try the E