PhotosMay 1, 2013August 12, 2013 Anne Marie and Bob Ryan were our great geologist guides on our field trip to Crystal Crescent Beach. Which way is the stream flowing? How do we know? Testing the pH of the stream using pH meters. How many young naturalists can you fit on a sand bar? Discussing how we might measure how fast the stream is flowing. Checking out another little stream. Anne Marie describes rock formation.