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In this environmental science activity (page 4 of the PDF), learners use vinegar and chalk to observe the effect of acid rain on various building materials and plant life.

$1 - $5 per group Ages 6 - 14 4 to 24 hours
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Learners will build and experiment with their own windmills made from simple household materials.

$10 - $20 per group Ages 6 - 14 30 to 45 minutes