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Middle school  
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Earth processes  
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This activity requires construction of a simple salinity tester. Students will create their own calibration scale during this experiment, and look at the change in salinity that would arise if freshwater was suddenly dumped into the ocean. Materials... (View More)

This field activity introduces students to the concept of a system. Students identify the components, inputs and outputs of the local system at a range of biometry study sites, as well as the boundaries of their investigations at these sites in... (View More)

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