Read:
Geology Rocks! pg. 85-89
Watch:
An intro. to caves for kids:
Activity 1: How Are Caves Formed?
Caves form when water that has a little bit of acid in it seeps down through the soil until it hits limestone. Demonstrate this with the experiment on pg. 86 of Geology Rocks! OR, use the one found here.
Activity 2: "Cave-cicles"
Complete the experiment on pg. 87 of Geology Rocks! to observe the two types of calcite crystals formed when limestone dissolves in caves: stalactites and stalagmites. Find another project to make stalactites and stalagmites at this website.
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