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  • Plate Tectonics

    Plate Tectonics

    Animations

    (1 min 16 sec) Plate tectonics is the unifying theory of Earth science.

  • The Geologic Carbon Cycle

    The Geologic Carbon Cycle

    Animations

    (6 min 20 sec) CO2 emitted by volcanoes into the atmosphere is removed by a series of chemical reactions related to rock weathering.

  • Greenhouse Effect

    Greenhouse Effect

    Animations

    (2 min 14 sec) Sunlight that warms Earth is re-emitted as infrared radiation, which is absorbed by greenhouse gases and causes further warming.