Check out this
story on how 4th and 5th graders in Michigan
used tracer dye
to show that harmful bacteria were getting into the Bear Creek Watershed
from septic tanks!
Now you can go to the activity
for an experiment that uses hands-on problems similar to this.
In the activity, you'll estimate the concentration
of a dye in water. You'll also calculate the volume of an
unknown amount of water, based on the mass of how much dye was dissolved
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