Get outside on the sidewalk (or inside on large paper!) with a hands on Geologic Timescale (Earth's History) Sidewalk Chalk lab that guides Earth Science students through diagramming, and adding important developments and events, with sidewalk chalk. This activity can also be done inside with butcher paper or bulletin board paper. Geology Students will create a list of Definitions / Descriptions of terms needed for their Geologic Time scale, then create their diagrams in chalk, add Eras