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"Xpeditions is home to the U.S. National Geography Standards-and to thousands of ideas, tools, and interactive adventures that bring them to life."

"These web pages will help you find out the basic facts of any state in the Union, including Washington, D.C. Need to know the capital of Alabama? Want to know which hockey teams are in California? How about the size of Montana? All that information is here - and more!"

Detailed information for the states, commonwealths, and territories of the US.

"Logic is the study of reasoning -- the nature of good (correct) reasoning and of bad (incorrect) reasoning. Its focus is the method by which an argument unfolds, not whether any arbitrary statement is true or accurate. Thus, an argument can be both deductively valid and perfectly absurd, as in 1. All telephone poles are elephants. 2. Sally is a telephone pole. 3. Therefore, Sally is an elephant. The conclusion is valid because it conforms to a correct syllogistic pattern -- in this case, affirmation of the antecedent -- but is ludicrous at the same time. "

"WhoWhatWhen is a database of key people and events from 1000 A.D. to the present. Create graphic timelines of periods in history and of the lives of individuals. "

"To help us think, talk and teach about the rights and responsibilities of citizens in our democracy, we invite you to explore 100 milestone documents of American history. These documents reflect our diversity and our unity, our past and our future, and mostly our commitment as a nation to continue to strive to "form a more perfect union.""

Games and information geared toward a younger audience.

"Do not go where the path may lead," wrote Ralph Waldo Emerson. "Go instead where there is no path, and leave a trail." That could be the motto of the Jet Propulsion Laboratory. Trailblazing has been the business of JPL since it was established by the California Institute of Technology in the 1930s. America's first satellite, Explorer 1 which launched in 1958, was created at JPL. In the decades that followed, we sent the first robotic craft to the moon and out across the solar system, reconnoitering all of the planets. Pushing the outer edge of exploration, in fact, is the reason JPL exists as a NASA laboratory.

A variety of resources sponsored by cable providers.

"Welcome to the U.S. Geological Survey's (USGS) Water Science for Schools web site! We offer information on many aspects of water, along with pictures, data, maps, and an interactive center where you can give opinions and test your water knowledge."

Various factual links for kids.

Connect with colleagues, create and share content in your own portfolio, join groups, engage in discussions, attend real-time online events using Elluminate's powerful web collaboration environment, and much more. LearnCentral is for anyone who is passionate about teaching and learning.

A field trip created with TourMaker guides you through a sequence of Web pages on any given topic. For each page, there is simultaneous commentary in an accompanying frame. You move forward and back through the Field Trip using the tour Control Panel and you can leave the Tour to explore links and return to it whenever you want.

"A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments. Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. Volcano eruptions have been known to knock down entire forests. An erupting volcano can trigger tsunamis, flashfloods, earthquakes, mudflows and rockfalls. "

"Geology Labs On-Line was initiated in 1999 to develop Web-based activities which enhance the learning and teaching of earth science from middle school through college classrooms. With these activities, students complete a sequence of tasks that require observation, measurement, and data analysis. Upon successful completion, they receive a personalized certificate. "

"The truth is that no one knows for sure though there are some pretty good guesses. The chances are that a number of processes combined to create the views that you see in todays Grand Canyon. The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water (and ice) and second by wind. Other forces that contributed to the Canyon's formation are the course of the Colorado River itself, vulcanism, continental drift and slight variations in the earths orbit which in turn causes variations in seasons and climate. "

Information about earthquakes from the USGS.

"View these animations that will show you how the three different kinds of rocks are formed by clicking on different areas of this picture."

"Earthquakes are the shaking, rolling or sudden shock of the earth's surface. Earthquakes happen along "fault lines" in the earth's crust. Earthquakes can be felt over large areas although they usually last less than one minute. Earthquakes cannot be predicted -- although scientists are working on it! "