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    Lunar and Planetary Institute
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    In this activity, learners measure the diameter of their water balloons, model an impact, measure the diameter of the “crater” area, and determine the ratio of impactor to crater. This activity is...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Twin Cities Public Television
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    In this activity (located on page 2 of the PDF), learners will identify a group of deciduous trees to study. Once the species has been recorded, the circumference of the trunks will be measured at...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    The Center for Science Education @ Space Sciences Laboratory, UC Berkeley
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    In this activity, learners build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon. Learners will use the...

    $1 - $5 per student Ages 6 - 14 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners make a scale model of the Solar System and learn the real definition of "space." Learners use the online calculator to create an appropriate scale to use as a...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    NCTM Illuminations
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    In this math meets life science lesson, learners measure the circumference of local trees in order to calculate diameters. Learners use this information and a growth rate table to estimate the age...

    1 cent - $1 per group Ages 8 - 14 45 to 60 minutes