[Free Registration/Login Required] In this video, students look at species diversity in the Potomac River in order to assess the health of the river. Students may want to use the documents on this page as they view the species in the...

[Free Registration/Login Required] Students test water from multiple locations on the Potomac River for dissolved oxygen, nitrates, phosphates, pH levels, salinity, and turbidity. What do these tests tell us about the health of the...