An in-depth explanation of the Earth's water cycle, including a hyperlinked diagram that provides direct access to information about each phase in the cycle.

This resource explains what pH is and how it relates to water. The resource includes a colored graphic of the pH levels and a map of pH levels around the USA.

You will find this list of questions interesting and amusing. "Things like, "Is salt water used for anything in the U.S.?," and How can we have a 100-year flood two years in a row?", are found on this this. Click Home to access the site in Spanish.

The United States Geological Survey offers a complete look at water science in glossary form. Take advantage of the topic guides at the top of the site. You'll find great maps, clipart and activities centers. Click Home to access the site in Spanish.

What is a sinkhole? Where are they found? What causes them? This text based article will providethe answer to these questions, and more!

An introduction, aimed at upper elementary- and middle-school learners, to acid rain. [Click back to home to access the site in Spanish.]

This website offers three activity centers: Questionnaires, Opinion Surveys, and Challenge Questions. Take a look at these interesting water research activities from the US Geological Survey. Click Home to access the site in Spanish.

This U.S. Geological Survey website offers a short article then lists topics that are linked to brief articles that describe that particular topic's effect on water quality in urban areas. Click Home to access the site in Spanish.

This U.S. Geological Survey website features a fictious town, Dryville, and uses it to illustrate every aspect of water management that you might encounter. Click Home to access the site in Spanish.

This thorough site delves into how we use water on an everyday basis. Ground water, surface water, domestic use, commercial use, irrigation use, are just a few of the topics described on this site. Click Home to access the site in Spanish.

Learn all about watersheds in this text based article. What are they? Where are they found? What purpose do they serve?

A quick summary of the water cycle that includes a diagram of the cycle, with links to in-depth explanations of each component of the cycle. Click "water-cycle home" to access water-cycle resources in a variety of languages.

Find out how much of the water on Earth is actually usable by humans, and where the rest of it is located. Learn where our water comes from and why it never runs out. Click Home to access the site in Spanish.

A collection of articles, games, printouts, facts, science fair ideas, and links through which students learn about the history and science of earthquakes and also explore what it takes to be an "earthquake scientist."

"Explore things on, in, around and about the earth," with this web site dedicated to K-12 education from the United States Geological Survey. Homework help, science topics and fun learning games for students in Kindergarten through High School.

The U.S. Geological Survey reports on the latest news affecting the earth today, as well as providing a wealth of data, reports, and information.