Celebrate Earth Day by completing these STEM challenges. Can your students design an alternative to plastic bags? Can your students engineer a device that can protect turtle nests? Combining Science, Engineering and real world Problem Solving Grades 3 through to 6! Linked to NGSS and the Australian CurriculumPLASTIC BAG CHALLENGE - What's included?✏ Challenge Cards (which also includes a variation to challenge students)✏ Suggested supplies list✏ Design Brief Student Template✏ Design Modific