STEM ACTIVITY -Be sure and visit our "What is the Difference between Weathering and Erosion?" post after you read this "Erosion vs Weathering ~ Awesome Science STEM Activities" post because they go hand-in-hand.
BFSU Lesson Air is Substance Weight of Air Activity - free hands-on science activity for and grade elementary kids. Part of a complete unit on Ecosystems: Ecosystems & the Food Chain. Meets Common Core and NGSS.