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    Earth

    planet Sun only object Universe known harbor life According radiometric dating sources evidence Earth formed billiyears ago Earth's gravity interacts objects space especially Sun an

    Beginner Lvl 1
    8h
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    1. Module
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    Daily Overview

    satellite photography

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    Google Earth

    Map, cities

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    American Museum of Natural History

    American Museum of Natural History

    Cultures

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    PBS Eons

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