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In this activity (located on pages 9-14 of PDF), learners visit a cemetery to examine the distinguishing characteristics of rock weathering.

free Ages 8 - 14 1 to 7 days
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This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates.

$5 - $10 per student Ages 14 - adult 1 to 4 weeks