The four major geographic regions of Texas are described in text and a slideshow, with a discussion of their landforms, climate, vegetation, animals, and resources.

An online exhibition which documents a scientific expedition up the Congo river in the early 1900s. You can view the complete photos, documents, and equipment by clicking on the left side navigation bar.

Experience the Okavango, a "river that never meets the sea." Learn about the animals there, how to make papyrus, and swampy deltas.

Macedonian Cultural and Historical Resource Center provides a source of general information on climate and weather for the Republic of Macedonia.

Read about the decision to list the Alabama sturgeon as an endangered species primarily due to its low population numbers and subsequent lack of ability to sustain itself through natural reproduction.

This resource provides information on watersheds, maps, activities, and links to local watershed information.

Explore this non-profit organizations site for watershed information.

Learn how the four different regions with their diverse geographical features make Texas' environment quite varied and unique, and how this influenced early settlers in the state.

The primary activity described here is measurement of sub-surface water properties in a local pond (e.g., temperature and dissolved oxygen).

A good look at the economy of Antigua and Barbuda showing how it is diversifying and growing. Read the chart which shows the parts of the economy. Information is from the U.S. State Dept. Background Notes.

A resource to help understand that the movement of the Earth's tectonic plates is caused by convection. The plates' movements cause geologic features on the Earth's surface.

After examining a map showing the expansion of the United States, click to read about each addition to the country and see where that addition is. Play Expansion Concentration to test your skills.

[Free Registration/Login Required] Students read about the Amazon River and its origins. A question sheet is available to help students build skills in drawing conclusions.

This resource provides a biography about Jedediah Smith, centering primarily around his explorations of the West in the 19th century.

Hueco Tanks is a historic site for Texas, from the ancient rock paintings to marking the last Indian battle in El Paso County. Texas Parks and Wildlife feature a concise history and overview of the Hueco Tanks.

Hueco Tanks is a historic site for Texas, from the ancient rock paintings to marking the last Indian battle in El Paso County. Texas Parks and Wildlife feature a concise history and overview of the Hueco Tanks.

This site is from the National Park Service. No shoe stores at this mall! Find out about our national "front yard" -- statistics, a link to the history of the National Mall, and a listing of all the monuments on the Mall. Also includes a...

Use this site to explore the rich history of Nevada. Learn about Native American culture from the past and in the future.

A description of the Battle of Big Hole in which the Nez Perce and whites alike suffered many casualties. From the National Park Service.

An interactive site showing the Native American culture areas and the major tribes living in those areas before the arrival of the Europeans. Click to find out more about Indians living in those area and find a game that challenges you...

This is an extensive look at the economy of Chad. Read about the development of its petroleum reserves, although most are dependent on agriculture. A chart is included. Information is from the U.S. State Dept. Background Notes.

[Free Registration/Login Required] An informational text about endangered lowland gorillas. A question sheet is available to help students build skills in reading comprehension.

Extensive listing of the Native American Indian Cultures from Mexico and various parts of South America. Click on an Indian culture and obtain valuable information about each unique tribe.

[Free Registration/Login Required] Get a visual of how a divergent boundary can cause a rift valley to form in the ocean on this site. Test your knowledge of the mid-ocean ridge on this page.