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In this activity (page 11 of the PDF), learners investigate how quickly water moves through various materials. They measure and compare the permeability of gravel, sand, and soil.

$10 - $20 per group Ages 11 - 14 45 to 60 minutes
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In this geology activity, learners use a microscope to discover and identify the components of sand.

$1 - $5 per group Ages 11 - 18 45 to 60 minutes