Big Ideas | Page 9

Grades K–2 Overview People—like all living beings—rely on the natural world in order to survive. The water and electricity we use in our homes and schools, for example, can be traced back to nature. By exploring why we need water and electricity, and by investigating where these resources come from, students begin to understand the importance of keeping water clean and learn how to help save water and reduce demand for electricity. BIG IDEAS | Grades K–2 | SAN FRANCISCO PUBLIC UTILITIES COMMISSION 9