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In this activity, learners determine the shape of an unseen object by bouncing a ball off the object.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners observe mixtures of sand samples glued to note cards, and consider how sand can differ in size, shape, and color, and where it comes from.

1 cent - $1 per group Ages 4 - adult 10 to 30 minutes