How the sun's energy drives the water cycle on Earth.

Where does your water come from? Join Ken, a hydrogeologist, and learn all about groundwater. [4:47]

In this video, a class discusses evaporation and condensation.[5:36]

Watch a class discusses their ideas about evaporation and condensation. [9:45]

In this video, a teacher demonstrates heating water in a beaker. [3:16]

In this video, a class discusses evaporation and condensation. [4:40]

A video poem describing the path water takes as it travels through water cycle as it evaporates, condenses and turns into precipitation. [1:50]

Help students understand how the water cycle works with this fun rap song. Get the class moving and learning! [2:22]

Paul Andersen starts by defining transpiration as evaporation off of a leaf. He then describes how a potometer can be used to measure the rate of transpiration in different environments.

Researchers studying nanoscale structures have found materials that assemble themselves into spirals, capable of holding tightly to each other or to materials in their center.