Unit Title	Author
2021
Shining Star	Valerie Adams
Keywords: carbon cycle, Chemical reaction, Electron, energy, Energy level, Solar, Photovoltaic, Carbon, Photon, Wind, water
Humans and the Environment: How Water Pollution and Littering Affect Health	Chelsea Maher
Keywords: world, engineering, environment, Health, pollution, littering, water, waterways, urban
Freshwater In Our World: Philadelphia’s Freshwater Supply and the Role We Each Play in its Future	Phyllis Hurwitz
Keywords: climate change, distribution of water, hydrologic cycle, impermeable sources, philadelphia middle school science, water pollution, water, urban watershed
Where Does Our Water Come From?	David White
Keywords: water, Watershed, water pollution, water filtration, water cycle
2011
The Extraction of Natural Gas through Hydraulic Fracturing on the Marcellus Shale Formation in Pennsylvania	John DiFiore
Keywords: geology, marcellus shale, natural gas, water