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demonstrates fundamental concepts related to earthquakes and global warming. Learn how to find the epicenter of an earthquake, how to determine richter magnitude, and how rocks are dated. Interactive tutorials explain the carbon cycle, water cycle, greenhouse effects, seasons, Milankovitch cycles, and albedo. Animations, inquiry-based activities, and assessments are provided. (California State University, Los Angeles, National Science Foundation)
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The shape of the earth's orbit (eccentricity), the tilt of its axis (obliquity), and direction of its axis (precession) change slowly and periodically over time. These cycles cause variations in the amount of solar energy reaching earth. Scientists believe these cycles play a role in the earth climate. |
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Alaska 1964 |
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