Students can practice analyzing structure with linear inequalities with these multiple-choice practice problems.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Explains the basics of atomic structure, from simple definitions to information about quantum theory. Accurate and helpful basics whether or not you need the more advanced information.

This is a very comprehensive site, a complete collection of Marvell's works and several critical essays, in additon to biographical material.

This investigation uses Cabri Jr. and a cleaver rotation of a triangle to "prove" that the angles in a triangle add up to 180. This could be used to reinforce triangles and paralled lines as well as introduce the concept of rotating an object.

In this activity, students will investigate properties of angles and arcs formed when chords, secants, and tangents intersect and intercept arcs in a circle. They discover several important theorems concerning circles and arc sizes. They make use of the Central Angle theorem, which ensures that the measure of a central angle of a circle is equal to the measure of its intercepted arc.

Full text and search engine for the Anglo-Saxon Chronicle, in which the history of Britain, from the 1st Century to the 12th, is rendered by scribes. Translated into modern English.

It takes a thick skin to withstand the hardships that life has to offer. This collection of images shows a variety of animals, each with a slightly different type of protective covering.

This collection of images of six different creatures, including insects and carnivorous vertebrates, illustrates the wide range of mouth types that exist within the animal kingdom. It also discusses the environment and its impact on the evolution.

Use this guide to help you identify signs from different animals in the wilderness. Identify tracks, chew marks, signs from animals that build, eggs, and the like.

Contains plans for five 50-minute lessons that ask students to compare and research information about animals from fiction and nonfiction texts. In addition to student objectives and standards, these instructional plans contains links to PDF handouts and links to sites used in the lessons as well as assessment and reflection activities.

Information from the symposium of the 30th anniversary of the Animal Welfare Act as provided by the U.S. Department of Agriculture.

This site provides a selection of major authors and works associated with English literature, ranging from Geoffrey Chaucer to Sir Isaac Newton. Each author's page contains online texts of the author's works, essays about the author and works, a biography, memorable quotes, and much more. Most also include a clip of music from the author's period.

The Smithsonian institute offers this site by Robert L. Humphrey titled, "Anthropology on the Internet for K-12." Includes excellent information on the different branches of anthropology, careers, exhibits, publications, and more.

Read about Becquerel's (1852-1908 CE) contributions to the world of science, which earned him The 1903 Nobel Prize in Physics. This detailed biography includes important dates as well as an overview of his world with radioactivity.

A detailed biography of Anwar al-Sadat. Site contains photographs and links to further information.

Images, text and audio recording of the events surrounding the first landing on the Moon in 1969. Easy access to images and sounds.

Read the minute-by-minute flight plan of Apollo 11. Links to other information about Apollo 11.

A comprehensive site focused on all of the Apollo missions. Includes details on launches and moon landings, with charts, statistics, and images. Especially interesting is the list of "Top Ten Apollo Results," which explains the major discoveries from the Apollo missions.

Grades 9-12. Describes the logic behind the development of Newton's law of universal gravitation. Beginning with Johannes Kepler and his three laws of planetary motion, content walks the reader through Newton's thought process and development of this theory. Detailed diagrams and animation of planetary motion are also provided.