Edutopia – Lori Brenneise
“To replicate storms and the formation of river deltas, I fill the pizza pan with about one inch of loose dirt. Then I pour water slowly from one spot near the edge of the pan. By the time the bottle is empty, the beginnings of river channels and small lakes appear. Sometimes I add fine glitter to the soil so that my students can track how topsoil is displaced from one place to another.” (more)