May 25, 2012
Carina Herbst, from Heritage High School, measures the dissolved oxygen level in water from the Muddy River near Mount St. Helens. Students tested several aspects of water quality in the waterway that was filled with ash and silt after the 1980 eruption.
Disclaimer
This photograph was submitted by a member of our community. If you find this photograph objectionable, please suggest this photograph for removal.
Suggest Removal
