"When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable 'trophic cascade' occurred. What is a trophic cascade and how exactly do wolves change rivers?
This is an awesome way to teach the water cycle. It would be a great idea for the take home kit because it is very easy for the students to do at home. You put water in a baggy and hang it on a window and leave it so you can see the condensation and draw the different cycles on the baggy to fit what was happening over time. -KT