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View Resource The Grand Canyon: How It Formed

Today, in the deepest part of the Grand Canyon, the Colorado River flows past rocks that are 1.7 billion years old. This video describes how the river cut vertically through layers of pre-existing rock as the plateau beneath it was uplifted by tectonic forces. It also explains that other forces worked to widen the canyon, particluarly the activity of tributary streams and debris flows caused by...

View Resource 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 real terrain. This is one within a much larger set of learning modules hosted by Duke University.

View Resource Introduction to Geology

If you are having difficulty remembering the details of the Earth's geological structure or the nature of major minerals and rock types, you can consult this excellent introductory course offered as part of MIT's OpenCourseWare initiative. The materials are drawn from Professors Perron and Jagoutz's 2011 "Introduction to Geology" course, and they include a number of lecture notes, available for...

View Resource Balloon Photography of Earth Fissures Near Apache Junction

Hosted by Arizona State University, this site contains balloon photographs taken from above the Apache Junction. A series of geologic structures are shown by these photographs. It gives a comprehensive look at different aspects of this site.

View Resource Wetlands International

Established as a non-governmental organization, Wetlands International is concerned with promoting the conservation and wise use of wetlands on the global, regional, and national levels. Much of the information on the site is contained within a dozen or so sections along the left-hand side of the homepage. First-time visitors may want to read through the "About Us" area before proceeding to the...

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