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Interactives: The Rock Cycle
How much do you know about rocks? Well, if you are a bit unsure about distinguishing an igneous rock from a sedimentary rock you'll certainly be on solid ground after taking a tour through this feature created by Annenberg Media. Visitors can make their way through graphically-enhanced sections that include "Types of Rocks", "How Rocks Change", and "The Rock Cycle Diagram". In the "Types of Rocks" area visitors will learn about the basic types of rocks and they can even check out a handy chart that will give them some of the finer points of rock identification. The "How Rocks Change" area provides a basic overview of the processes involved with rock creation and transformation through a...
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Fossil Fuels: Oil PDF
This lesson provides an introduction to the world oil market and the United States' dependence on it. Topics include our current usage, sources, and the...
Acid Rain PDF
Due to the presence of dissolved gases such as carbon dioxide, rainfall is naturally acidic. The release of other gases and chemicals such as sulfur dioxide...
The First Law of Thermodynamics PDF
This lesson builds upon the previous one (Newton's Second Law) by introducing students to kinetic and potential energy. Topics include a brief description of...
Tectonic Plate Movements and... PDF
This lesson introduces the idea that rates and directions of plate movements can be measured. The discussion centers on the use of mantle 'hotspots' to...
Ozone Depletion PDF
Discussion of holes in the stratospheric ozone layer usually revolves around investigations of the thickness of the layer near the South Pole. This online...



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Close-up of a family of Cantharellus Cinereus in a forest.
The Great Pyramid at Chichen Itza, Mexico.
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