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An Electrical Storm on the Horizon: Can Technology Stimulate Reasoned Debate on Waste Containment
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In this fictional case study, the state of Oklahoma has profited by giving incentives for companies to build power plants in rural areas of the state. The "scrubbing" systems used to minimize air pollution create potentially hazardous solid waste.To contain this waste, an impoundment facility has been built on unsuitable land from which water-soluble toxins can leach into groundwater. Student teams design a prototype sensor capable of measuring dissolved oxygen and fluorescein dye in water in order to analyze the runoff from the impoundment facility for toxins. The case was developed for an undergraduate laboratory course in photonics for junior- and senior-level students.

Author:
Alan Cheville
Endangered? The St. Croix River: A Case Study in Water Stewardship
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Managing the St. Croix River has sparked tremendous controversy due to conflicting uses of the river. At risk is the water quality and aesthetic value of this National Scenic Riverway. The drama unfolding around the St. Croix River is used in this case study to illustrate water resource concepts and the difficulties that can arise when making decisions about natural resources. Designed for a water resources course taken primarily by undergraduate juniors and seniors, the case could be used effectively in classes covering water quality, water policy, environmental policy, limnology, stream ecology, environmental studies or science, or environmental decision making.

Author:
Pamela Locke Davis
Energy Pyramids in Different Biome Locations
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This activity involves student research on the Internet to create a PowerPoint presentation showing the various parts that make up a biome (abiotic & biotic factors).

Author:
Lora Rantanen
lora rantanen
Erosion in Our World
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This activity is a field investigation where students find real-life examples of erosion in their school surroundings. Students will extend what they learned during stream table lessons about erosion, deposition, deltas, meandering streams, and dams.

Author:
Abbey Payeur
Erosion in Our World
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This activity is a field investigation where students observe evidence of erosion and deposition in the schoolyard or designated area.

Author:
Erin Leitner
Erin Leitner, North Elementary School, Princeton, MN, an extenstion activity to go along with the Landforms unit from the FOSS Kit.
Ethanol or Biodiesel?: A Systems Analysis Decision
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In this case study, two students have been asked to conduct a "systems analysis" study to determine whether ethanol derived from corn or biodiesel prepared from soybeans is the more energy efficient alternative fuel. The students must investigate the two systems very broadly to determine all energy inputs and outputs. When the corn-to-ethanol system turns out to be less energy efficient, the students are asked to consider the political and economic consequences of this and the role that science plays in making policy decisions. The case is designed for general chemistry courses and non-science majors' chemistry courses.

Author:
Thomas R. Stabler
Frank J. Dinan
Eureka! Or Buoyancy and Archimedes' Principle
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Students explore material properties in hands-on and visually evident ways via the Archimedes' principle. First, they design and conduct an experiment to calculate densities of various materials and present their findings to the class. Using this information, they identify an unknown material based on its density. Then, groups explore buoyant forces. They measure displacement needed for various materials to float on water and construct the equation for buoyancy. Using this equation, they calculate the numerical solution for a boat hull using given design parameters.

Author:
TeachEngineering.org
CREAM GK-12 Program, Engineering Education Research Center, College of Engineering and Architecture,
Andy Wekin
Exaggerated Traits and Breeding Success in Widowbirds: A Case of Sexual Selection and Evolution
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Sexual selection has led to the evolution of interesting traits and behaviors in many animal species. In widowbirds, males undergo a dramatic change in plumage coloration and produce exceptionally long tail feathers during the breeding season. This change in appearance has facets of both intrasexual and intersexual selection. As students work through this interrupted case, they develop hypotheses and propose corresponding experiments. They are then presented with data from actual experiments on sexual selection in widowbirds that they must analyze and interpret. Developed for introductory-level biology students, the case could be adapted for upper-division ecology and evolution courses.

Author:
J. Phil Gibson
Experimental Design and Statistical Analysis: Bt Corn, Lignin, and ANOVAs
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This case is based on a research paper about the lignin content of genetically modified corn published in the American Journal of Botany. Students are asked to analyze and discuss the paper, focusing on questions related to experimental design and interpretation and a critique of the statistical data presented. Developed for use in an upper-level undergraduate course in plant ecology and a graduate biostatistics course, the case could also be used in courses in plant anatomy, plant physiology, soil ecology, agriculture, or genetics.

Author:
Eric Ribbens
Exploring A Decomposition Community
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This activity allows elementary students to construct a decomposition column in order to observe the relationship between living systems and energy sources.

Author:
LaRae Mikkelson
LaRae Mikkelson, Ellen Hopkins Elementary, Moorhead, MN
Famous Scientists
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This lesson is a presentation of famous scientist throughout history where the students will learn and take notes about the contributions and discoveries made in science.

Author:
Pam Schilling
The Fate and Transport of Toxic Releases: A GIS Case Study
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The release of toxins into the environment and the federal government's tracking of that using the Toxic Release Inventory (TRI) compiled by the U.S. Environmental Protection Agency (EPA) are the focus of this case study, which uses GIS to explore the potential impacts of the release of such substances. The case was developed for an introductory environmental studies course. It would also be appropriate for use in an introductory GIS course or cartography course where some analysis is required, an introductory chemistry course for non-majors (with some more prep work on partitioning coefficients and fate and transport), or a basic soils course where remediation techniques are emphasized. The case study requires ESRI's ArcView 3.3 software in a computer lab setting, although it could easily be adapted for use with ArcGIS 9.x.

Author:
David W. Kelley
Faucet Flow Rate
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Students conduct experiments to determine the flow rate of faucets by timing how long it takes to fill gallon jugs. They do this for three different faucet flow levels (quarter blast, half blast, full blast), averaging three trials for each level. They convert their results from gallons per second (gps) to cubic feet per second (cfs).

Author:
Civil and Environmental Engineering Department,
Karen Johnson
Bobby Rinehart
TeachEngineering.org
Mike Mooney
Field Activity:  Exploring Glaciers, Ancient Seas, and Volcanism
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In a field investigation to Interstate State Park, students determine lava flow boundaries and observe an ancient rift valley. They also examine differential erosion rates that create a waterfall, and examine the local basalts for evidence of glaciation, including the world-famous potholes.

Author:
Ann Berg
Ann Berg