Acid rain. Two researchers measured the pH (a scale on which a value of 7 is neutral and values below 7 are acidic) of water collected from rain and snow over a 6-month period in Allegheny County, PA. Describe their data with a graph and a few sentences:
![1648_0545e67e-ea7e-426a-aab0-86f50a872c43.png](https://secure.tutorsglobe.com/CMSImages/1648_0545e67e-ea7e-426a-aab0-86f50a872c43.png)