Just north of Withrow, Washington, the pancakeflat farms and fields are dotted by massive mysterious basalt boulders. These rocks, picked up and moved by ice sheets in the last Ice Age, help Nick visualize the moraine of a giant bygone glacier.

Watch more episodes of Nick on the Rocks:    • Nick on the Rocks  

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Special thanks to Central Washington University as the original creator and collaborator for Nick on the Rocks.