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The Following are some useful websites that can be used to gather information from on the Topic of Planet Earth: Gradual and Sudden Changes.

 This Web Page provides information and student asked questions to help you better understand volcanoes

Volcano Web

http://www.mcli.dist.maricopa.edu/tut/tut23_ex/

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This web page is designed to teach about plate tectonics and how the affect earthquakes

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Plate Tectonics, the Cause of Earthquakes

http://www.seismo.unr.edu/ftp/pub/louie/class/100/plate-tectonics.html

 

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This site furthers knowledge on volcanoes and their effects on the environment

Exploring the Environment

http://www.cotf.edu/ete/modules/volcanoes/volcano.html

 

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Shows and demonstrates an understanding of how we can measure earthquakes and the tools and techniques we use

Measuring, Monitoring, and Predicting http://www.exploratorium.edu/faultline/earthquakescience/eqscience5.html