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"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. "

"UPSeis (pronounced "up size") is a program created to teach young people (and not-so-young people) more about the planet we live on and how it works. The UPSeis program is divided into two parts: this web site and a school program. In the UPSeis web site, we'll be talking mostly about the science of seismology and earthquakes: where they happen, why they happen, and what kinds of problems they cause. We'll tell you things you may already know and some stuff you may have never thought about."

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

"Lesson plans contain all teacher and student materials to teach lesson successfully."

HowStuffWorks, a wholly owned subsidiary of Discovery Communications, is the award-winning source of credible, unbiased, and easy-to-understand explanations of how the world actually works. Founded by North Carolina State University Professor Marshall Brain in 1998, the site is now an online resource for millions of people of all ages.

"The world's most comprehensive dictionary: English, Spanish, German, French, Italian, Chinese, Portuguese, Dutch, Norwegian, Greek, Arabic, Polish, Turkish, Russian, Medical, Legal, and Financial Dictionaries, Thesaurus, Acronyms and Abbreviations, Idioms, Encyclopedia, a Literature Reference Library, and a Search Engine all in one!"

"Essay Info is for anyone who wants to improve the writing skills. Whether your purpose is to get better grades at school or just to enjoy the writing process Essay Info will lead you to your goal. It is intended mainly for college students and useful for those of you, who strive to write more clearly, gracefully, and efficiently. We are not limited to the information about the basics of academic writing. We bring to your attention hints on effective resume and cover letter writing, making a presentation in class and at work. At Essay Info you can find quick tips for making any writing assignment sound great. If you just plan to enroll to college, Essay Info will provide you all information you need on financial aid and finding money for your college education. We know everything about scholarships. We know how to apply and get one. We have a ready plan of actions for you."

Educational games and resources provided by the BBC.

ThinkQuest is a protected, online learning platform that enables teachers to integrate learning projects into their classroom curriculum and students to develop 21st century skills.

The History Place is a private, independent, Internet-only publication based in the Boston area that is not affiliated with any political group or organization. The Web site presents a fact-based, common sense approach in the presentation of the history of humanity, with great care given to accuracy.

This Web site is brought to you from the Library of Congress in Washington, D.C., the largest library in the world and the nation's library. We hope you will find this Web site entertaining and fun to use. And, of course, we hope you will learn something from it. The site was designed especially with young people in mind, but there are great stories for people of all ages, and we hope children and their families will want to explore this site together.

"Technological Pedagogical Content Knowledge (TPACK), builds on Shulman's idea of PCK, and attempts to capture some of the essential qualities of knowledge required by teachers for technology integration in their teaching, while addressing the complex, multifaceted and situated nature of teacher knowledge. At the heart of the TPACK framework, is the complex interplay of three primary forms of knowledge: Content (CK), Pedagogy (PK), and Technology (TK)."

The World Digital Library (WDL) makes available on the Internet, free of charge and in multilingual format, significant primary materials from countries and cultures around the world. The principal objectives of the WDL are to: * Promote international and intercultural understanding; * Expand the volume and variety of cultural content on the Internet; * Provide resources for educators, scholars, and general audiences; * Build capacity in partner institutions to narrow the digital divide within and between countries.

Compares results from two search engines. A great tool to demonstrate why you should use more than one search engine.

Virginia General Assembly Web site provides information on state representatives, and the politics of Virginia.