🌍 Earth Day Collaborative Poster | 2D Shape Geometry Guess Who Make Earth Day math more interactive, creative, and memorable with this 2D Shape Geometry Guess Who Collaborative Poster activity. Students will identify shapes using clues, color the pieces, cut and paste the matching Earth-friendly shape cutouts, and work together to build a large Earth Day poster. This resource combines geometry review, shape identification, and collaborative learning in a fun Earth Day format. It is a grea