For Social Studies:

You can find the Google Earth resources here.

The Newseum
"The Newseum, a museum of journalism, presents full-color captures of the front pages of newspapers from 38 different countries, organized alphabetically by county. Simply run your mouse over a thumbnail to display a larger image of that newspaper and then click on it for an even closer look. This is a great site for language arts, for social studies, and for journalism classes."

Using MS Excel to make a timeline:
Students create a timeline. They designate periods of time by utilizing fill colors to fill in groups of cells. Text can even be entered sideways to mark the events being represented. If students are feeling creative, they can enter text inside a drawing such as a rectangle or add pictures to jazz up the timeline. Younger students might just use pictures to represent events on their timeline.

David Rumsey Historical Map Collection:
The David Rumsey Historical Map Collection has over 13,600 maps online. The collection focuses on rare 18th and 19th century North and South America maps and other cartographic materials. Historic maps of the World, Europe, Asia and Africa are also represented. Collection categories include antique atlas, globe, school geography, maritime chart, state, county, city, pocket, wall, childrens and manuscript maps. The collection can be used to study history, genealogy and family history.

Geotagging in Flickr:
Flickr's great for exploring photos by photographer, tag, time, text and group, and now it's also great for exploring photos by place. There are a couple of short video tutorials (or "screencasts") which give the 90 second overview on how to geotag your own photos and how to use all the controls for searching and exploring geotagged photos. Watching them first will give you all of the information you need to get up and running. Read another example of how to geo-tag photos for education.

Great Geograpy Games from Sheppard Software:
Learn the geography and capitals of the countries of the world, as well as the states and territories of the United States, Canada, and Mexico.

Specific topic-based links:

Ancient Africa Resources (grade 6):