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In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes
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Learners work in pairs to design, construct, and test a device that exhibits positive, neutral, and negative buoyancy. They test a number of different objects in water to see if they sink or float.

$1 - $5 per group Ages 8 - 11 45 to 60 minutes
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Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes