Videos A to Z

  • Forces Shaping the Earth: Rock stretching

    • 3-5
    • 6-8
    • 9-12

    Rocks under tension can be stretched.  » more info

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  • Forces Shaping the Earth: Thrust fault

    • 3-5
    • 6-8
    • 9-12

    A thrust fault is formed when the hanging wall moves up and over the foot wall. Thrust faults are common in mountain ranges where intense folding is found.  » more info

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  • Forests: Forest locations

    • 3-5
    • 6-8
    • 9-12

    Several types of forests are highlighted on the map, including northern coniferous forests (located between 50-60 degrees latitude), temperate forests (located below 50 degrees latitude), and tropical…  » more info

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  • Forests: Subtropical forest

    • 3-5
    • 6-8
    • 9-12

    The subtropical forest is located in southern Florida, mostly in the Everglades.  » more info

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  • Forests: Temperate deciduous forests

    • 3-5
    • 6-8
    • 9-12

    Temperate deciduous forests cover most of eastern North America below 50 degrees north latitude.  » more info

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  • Forming Bonds: Ionic bonding

    • 3-5

    An ionic bond involves the transfer of electrons from one atom to another. Ionic bonding gets its name from the word ion. An ion is a charged atom.  » more info

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  • Fossils: Cast

    • 3-5
    • 6-8
    • 9-12

    When a plant or animal is buried by sediment, it decays over time and leaves a space. A cast is formed when this space is filled by sediments or minerals that harden over time.  » more info

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  • Fossils: Index fossils

    • 3-5
    • 6-8
    • 9-12

    Index fossils are fossils of organisms that lived during the same general period of time. Geologists assume that layers of rock containing these organisms are close in age.  » more info

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  • Fossils: Mold

    • 3-5
    • 6-8
    • 9-12

    When a plant or animal is buried by sediment, it decays over time and leaves a space, referred to as a mold.  » more info

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  • Fossils: Petrification

    • 3-5
    • 6-8
    • 9-12

    Petrification is the process by which cells in once-living things are replaced by minerals in water, turning the preserved part o stone.  » more info

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