The Water Cycle - A detailed illustration of how water moves through the environment.

- Water, driven by the heat of the sun, changes into vapor and rises into the air.
- Water vapor cools and changes back into liquid form.
- Rain and snow fall onto land and into the ocean.
- Surface runoff flows over the land toward the ocean.
- Underground water filters down and moves toward the ocean.
- Plants open their pores for carbon dioxide and lose water to evaporation.