Below is the hydrological cycle courtesy of the Mojave Water Agency:

The Hydrologic Cycle (also called the Water Cycle) is the process that moves water around the earth. The term "hydrologic cycle" refers to the constant movement of water above, on, and below the earth's surface. The Water Cycle can change the form of water from liquid to water vapor to ice, and even clean it along the way, but it can’t make more water. Water is not created or destroyed, but simply changes location and form. The water you drink today may have been lapped up by dinosaurs millions of years ago, or helped fill Julius Caesar’s bathing pool. The water we use now is the same supply the human race started with. Its quality is renewed again and again by the natural hydrologic cycle.