Sorry, please try question 2 again. Biological soil crusts live on all of the sand in the park. It's not always dark and bumpy.
Don't Bust the Crust Please Try Activity 2 Again
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Last updated: February 24, 2015
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Sorry, please try question 2 again. Biological soil crusts live on all of the sand in the park. It's not always dark and bumpy.
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Last updated: February 24, 2015