Marshmallows 101

Chemistry - Have fun munching and constucting a marshmallow atom!
Featured above:
3D model - Angelfire
Paper Plate "Electron Shells" - The Daniel Academy
2D model - Lights, Camera, Learn

More atom activities:
Over-sized outdoor atom on the blacktop - 5th Grade Rocks, 5th Grade Rules - kids play the role of the protons, neutrons, and electrons! Plus, many more hands on projects!
Scholastic - Chemistry for 3rd graders - lots of activities that kids can snack on!

photo via adventures of first grade

Geometry - If you don't eat all of your marshmallows, save them for a the classic toothpick and mini marshmallow geometry lesson! Kids construct outlines of 3D solids, as well as polygons. This is a great activity to help kids count the vertices of shapes! (Note: You will want to use dried spaghetti for the rectangular prism to get the correct number of vertices) Visit Adventures of First Grade for details! There is even a scavenger hunt to go along with this activity!

photo credit Tufts Now

Engineering - You can also just have fun free stylin'! Kids can become mini engineers and build skyscrapers and bridges! Who can make the tallest structure without it collapsing?! - link for tall structures here!