Water Cycle in a Jar. Fill up 1/4 of the jar with water, put a small cup in the middle. Loosely cover the top of the jar with plastic wrap, adding a rock to weight down the center. Put lid back on jar. I added stuffing to look like a cloud. Sit in sunlight. It takes a while, but after a while you will see condensation on the plastic wrap. After it builds up, the condensation will slide down the slope to the place where the rock is, then fall off the end. My science teacher showed this to me.
