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In this activity, learners explore how salt water freezes in comparison to fresh water.

1 cent - $1 per group Ages 6 - 14 1 to 2 hours
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Many people get water from a source deep underground, called groundwater.

$10 - $20 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners create a biosphere in a baggie.

$1 - $5 per student Ages 4 - 11 1 to 7 days
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In this physics activity (page 10 of the PDF), learners will explore how energy from moving water can be used.

$1 - $5 per group Ages 6 - 14 30 to 45 minutes