STEM Science Resources is a great resource to use while teaching about science concepts. Word Wall Words, Flip Book, and STEM Challenge. Teachers, this Science STEM Challenge packet is a resource that helps supplement a science study on Natural Disasters, fossils, rocks, and force and motion. These activities help meet the Third Grade Next Generation Science Standards but work great in grades 2nd-5th as a supplement. These activities are great for whole group instruction, science stations, or exploration/observation labs.