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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

$1 - $5 per group Ages 8 - 18 1 to 7 days
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An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.

$10 - $20 per group Ages 8 - 18 1 to 4 weeks