Table 1. Texts for "How Are Humans Impacting Water?": Types of scientific knowledge addressed and text types represented

Title	Reference	Type fo Scientific Knowledge Addressed	Text Type
What's In Our Water?	Students' Own Collected Data	Scientific Epistemology; Scientific Inquiry and Reasoning	Data Table
The Water Cycle	www.usgs.gov/media/images/water-cycle-natural-water-cycle	Overarching Concepts	Diagram
How Are Humans Impacting Water?	“Diagram of Unhealthy Water System,” World Book, 2011	Overarching Concepts	Diagram
Third Creek Unsafe for Swimming	Tennessee Journalist, January 12, 2011	Scientific Inquiry and Reasoning	Photo and Caption
Chicago River Contaminated	Chicago News Cooperative, May 17, 2011	Scientific Inquiry and Reasoning	Photo and Caption
No Day at the Beach	Adapted from Jason Gorss, “No Day at the Beach,” Scientific American, July 19, 2004	Language Structures	Article
Where Does Water Come From? Where Does It Go?	https://wested.box.com/s/1umdoa6foytruv82mu16mhommuw08ryh	Overarching Concepts	Article with Diagram
Non-Point Source Pollution	http://water.epa.gov/polwaste/nps/outreach/point1.cfm	Scientific Inquiry and Reasoning; Language Structures	Article
Our Polluted Beaches	www.emagazine.com/magazine-archive/our-beleaguered-beaches	Scientific Inquiry and Reasoning; Language Structures	Article