Salinity is the measurement of how salty the water is.
You will probably find that salinity is nearly the same at the three spots you measured. Scientists measure salinity in parts per thousand (ppt).
You will see that the measurements only range from 32 ppt to 37.5 ppt.
That means out of 1000 grams of water, the salt content only varies by about 5 grams. (1gram = the weight of a paper clip)
There are three main factors that affect salinity:
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