This activity focuses on getting students to think about bacteria, water quality …
This activity focuses on getting students to think about bacteria, water quality and water treatment processes. Students develop and test their hypotheses about the "cleanliness" of three water samples prepared by the teacher. Then they grow bacteria in Petri dishes from the water samples. They learn how private septic systems and community sewage and wastewater treatment plants work, the consequences to the surrounding environment and wildlife from human wastewater, and what measurements of the released "clean" water are monitored to minimize harm to receiving rivers and lakes.
Contamination in drinking water sources or watersheds can negatively affect the organisms …
Contamination in drinking water sources or watersheds can negatively affect the organisms that come in contact with it. The affects can be severe causing illness or, in some cases, even death. It is important for people to understand how they can contribute to the contaminants in drinking water and what treatment can be done to counter these harmful effects. Students will learn about the various methods developed by environmental engineers for treating drinking water in the United States.
Just because you can̢ĺŰĺŞt see it doesn̢ĺŰĺŞt mean it isn̢ĺŰĺŞt there. Whether …
Just because you can̢ĺŰĺŞt see it doesn̢ĺŰĺŞt mean it isn̢ĺŰĺŞt there. Whether it sinks or floats, plastics in the sea spell trouble for all the animals in the ocean. By matching animal cards to plastic risks, students find out the many ways marine life can be affected by plastics in their aquatic home.
Though we often think of evolution as occurring at a snail's pace, …
Though we often think of evolution as occurring at a snail's pace, one fish species is highlighting just how quickly evolution occurs in the right circumstances. Between 1947 and 1976, General Electric released more than a million pounds of PCBs into the Hudson River. PCBs can kill fish and seabirds and have been linked to cancer and other serious health problems in humans. PCBs were banned in 1979, but the toxins have remained at high levels in the Hudson because they settle into the sediments on the bottom of the river and don't break down. Now, scientists have discovered that, over the past 60 years, one bottom-feeding fish species, the Atlantic tomcod, has evolved resistance to PCBs.
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