If you are looking for worksheets about alternative energy sources to use on Earth Day, you'll find several here. However, since Earth Day is all about conserving natural resources, please print these double-sided in order to reduce the amount of paper used! Activities include a crossword puzzle, word search, vocabulary matching exercise, drawing activity, maze, Sudoku puzzle, and more. While not very content-heavy regarding conservation of natural resources, these could be decent supplements to other environmental activities, or something for kids to work on when they have finished another assignment.