Videos A to Z

  • Earth's Rotation and Revolution: Earth's Tilt

    • 3-5

    Earth's axis is tilted at 23.5 degrees. As Earth revolves around the sun, its axis always points at the same angle, but the direction it points in relation to the sun changes, resulting in different seasons.  » more info

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  • Earth, Sun, and Moon: Earth's axis

    • 3-5
    • 6-8
    • 9-12

    Earth's axis runs from the north pole to the south pole and is tilted at 23.5 degrees. Rotation is the spinning of Earth on its axis. It takes 24 hours to make one complete rotation.  » more info

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  • Earth, Sun, and Moon: Phases of moon

    • 3-5
    • 6-8
    • 9-12

    The moon goes through several phases based on its position in relation to the sun and Earth. When the moon is between Earth and the sun, none of it is illuminated and it is referred to as a new moon.  » more info

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  • Earth, Sun, and Moon: Shape of Earth

    • 3-5
    • 6-8
    • 9-12

    Earth bulges slightly at the equator and flattens slightly at the poles.  » more info

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  • Earth, Sun, and Moon: Size of sun

    • 3-5
    • 6-8
    • 9-12

    The sun is huge compared to Earth. About one million planets the size of Earth could fit inside the sun.  » more info

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  • Earth, Sun, and Moon: Spinning Earth

    • 3-5
    • 6-8
    • 9-12

    Earth spins, or rotates, at a speed of about 1600 kilometers per hour at the equator.  » more info

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  • Earth, Sun, and Moon: Tilt of Earth

    • 3-5
    • 6-8
    • 9-12

    The tilt of Earth affects the length of day. When the north pole is tilted away from the sun, the northern hemisphere experiences less daylight. But when it is tilted toward the sun, it receives more…  » more info

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  • Earth, Sun, and Moon: Waning

    • 3-5
    • 6-8
    • 9-12

    Waning refers to the process of the full moon growing darker as the moon revolves around Earth. The animation depicts the last quarter phase, from which it slowly grows darker and disappears until it…  » more info

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  • Ebola: The Plague Fighters.

    • 9-12

    The Ebola filovirus causes a very deadly and highly contagious disease. Outbreaks thus far have been limited due to the implementation of strict isolation, sterilization, and waste disposal procedures;…  » more info

    • Episodes/length: 1 program(s) / 54 minutes
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  • Ecology Fundamentals: Energy path

    • 3-5

    The arrows illustrate one possible energy path in an ecosystem, from sun to seaweed to iguana.  » more info

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