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Social studies -- Geography
126 - 130
When Did the First Americans Arrive?
Who were the first Americans, when did they arrive, and from where did they come? With limited evidence, scientists have long proposed a hypothesis that linked the migration route and the timing of the migration of...
Analyzing Land Use Change In Urban Environments
This four-page fact sheet provides a brief summary of the analysis of land use in urban environments. Topics include the rapid growth in urban populations, some of the methods used to analyze land use change (mapping,...
Historic Topographic Maps of California: San Francisco Bay Area
This collection of historic topographic maps goes back to the late 19th century. Comparison of maps of the same area from different times allows users to observe changes in land use over time. The maps can be searched...
Urban Growth in American Cities
This online publication illustrates the spatial history of urban growth and corresponding land use change in sixteen areas around the United States. It features pairs of images of selected urban regions from across the...
Animation of 2006 Ozone Hole
The National Oceanic and Atmospheric Administration's (NOAA) polar-obriting satellites monitor the ozone levels around the globe. The ozone layer acts to protect life on Earth by blocking harmful ultraviolet rays from...
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