Since the density of fresh water is less than salt water it floats on
top. Under a Barrier Island a fresh water lens forms so it is
possible to find fresh water only a few feet deep and a few feet from
the ocean. In this activity we have the participants dig a series of
holes from the surf to the dune line and collect water samples. Then
we measure the salinity or salt content of the samples and have a
taste test. Most are hesitant at first, but surprised to taste fresh
water. We are using a salinometer donated by YSI Environmental
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