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provides activities, animations, and lessons on the structure, processes, and history of earth, as well as the solar system, and astronomy. Topics include earthquakes, faults, tectonic plates, soil liquefaction, Antarctica, convection currents in water, continental drift, extremophiles, auroras, subduction, Curie point, ozone, climate change, earth's magnetic field, and seasons. (Exploratorium, National Science Foundation)
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The Maya originated around 3,000 years ago in present-day Honduras, Mexico, Guatemala, and Belize. From around AD 250 to AD 900, the Mayan empire flourished in the southern regions. Around AD 900, the empire in the south collapsed. No one knows why. |
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Climate change and animal populations |
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