The hydrosphere encompasses all water on Earth from glaciers and ice to rivers and oceans. People use water every day. This title asks the question, how much do you use? Readers will learn how humans use water, how humans positively and negatively affect water, and how to protect the water supply.

What is the hydrosphere? -- People and the hydrosphere -- How people use surface water -- How people use ground water -- Overconsumption -- Pollution -- How can humans help?.