One of the main components of Earth’s interdependent physical systems is the hydrosphere. The hydrosphere is the sum of Earth’s water, in the ocean, the ground, on the surface, and in the air. Approximately 71 percent of Earth’s surface is covered in water. Of all of that water, only about three percent is freshwater. An even smaller amount can be used as drinking water. Water cycles throughout the system continuously as the sun’s radiation causes it to evaporate, rise into the atmosphere, condense, then fall as precipitation to be used or recycled.

Teach your students about the Earth’s hydrosphere with the resources in this collection.