Mary Hanan led her middle school science students on a year-long study of specific plots of land. Students made observations and collected data to demonstrate how their plot of land changed over time. Mary Hanan is a sixth-grade science teacher at Riverside Meadows Intermediate School in Plumas Lake, California. Photo courtesy Mary Hanan Could you give an overview of your National Geographic Educator Certification project, which you called “Piece of Earth?” I wanted my sixth-grade students to understand that scientific…