Topics

  • Endangered Species

    Endangered Species

    May 09, 2013 | Topic

    Endangered species are those in danger of extinction.
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  • Lightning

    Lightning

    May 09, 2013 | Topic

    Lightning is basically a giant spark of static electricity.
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  • Caves

    Caves

    May 09, 2013 | Topic

    Caves can range in size from single rooms to miles-long passageways.
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  • Volcanoes

    Volcanoes

    May 09, 2013 | Topic

    Most of Earth's volcanoes are located along the Pacific Ring of Fire.
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  • Earth's Atmosphere

    Earth's Atmosphere

    May 08, 2013 | Topic

    Earth's atmosphere is about 78 percent nitrogen, 21 percent oxygen, with trace amounts of water, argon, carbon dioxide and other gases.
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  • The Arctic

    The Arctic

    May 08, 2013 | Topic

    The Arctic is largely an ice-covered ocean.
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  • Deserts

    Deserts

    May 08, 2013 | Topic

    Deserts can be hot and dry, like the Sahara, or cold and dry, like Antarctica.
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  • Tsunamis

    Tsunamis

    May 08, 2013 | Topic

    Tsunamis can be created by earthquakes, underwater landslides and volcanic eruptions.
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  • El Nino and La Nina

    El Nino and La Nina

    May 08, 2013 | Topic

    El Niño and La Niña are parts of a climate cycle that has implications for weather around the planet.
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  • Newfound Species

    Newfound Species

    May 08, 2013 | Topic

    Two million species are known on Earth, millions more remain undiscovered.
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