JOHN BOVA / SCIENCE PHOTO LIBRARY JOHN BOVA / SCIENCE PHOTO LIBRARY
Jerseyfield Lake, Adirondack Park, New York, with a critical pH level of 4.13 as a result of acid rain pollution. The pH scale is a logarithmic scale for expressing the acidity or alkalinity of a solution. A pH below 7 indicates an acid solution while one over 7 indicates alkalinity.
Model release not required. Property release not required.