At the Nature Exchange at the Dallas Zoo kids can bring in their found natural items (shells, pine cones, fossils, etc.) for trade. The more they know about the items, the more points they earn. They can then use the points to "buy" some of the cool specimens on display.
Here are some pictures of some of the geology related items they have on display at the Exchange:
Here are some pictures of some of the geology related items they have on display at the Exchange:
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