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GEM Subject is
Social studies -- Geography
646 - 650
Hiking and Climbing in Yosemite (Alternate Version)
Created by Lang Moore, Bill Mueller and David Smith for the Connected Curriculum Project, the purpose of this module is to establish the meanings of gradient and directional derivative in the context of a contour map of...
U.S. Fish & Wildlife Service: National Wetlands Inventory
Wetlands went through a hard time in the 19th and much of the 20th centuries as they were summarily drained and used for real estate development. Today, scientists, planners, and recreationists are well aware of the...
Great Lakes St. Lawrence Seaway System
The St. Lawrence Seaway connects the Atlantic Ocean to the Great Lakes, and it was completed in 1959. This website details the activities of the Seaway System, and visitors with an interest in transportation and public...
Created by the National Aeronautics and Space Administration (NASA), the purpose of this site is to provide a place where the public can obtain new satellite imagery and scientific information about our home planet. The...
The Round Earth and Christopher Columbus
This web page, created by David P. Stern, describes observations that show the earth is a sphere and the history of these observations. The round shape of the Earth may be inferred from the existence of a horizon at...
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