Assume that someone brings several water samples to your laboratory. His problem is that the labels.

Assume that someone brings several water samples to your
laboratory. His problem is that the labels are incomplete. He knows that
samples A and B are from the Atlantic Ocean; he also knows that one came from
near the equator, and the other came from near the Tropic of Cancer. But he
does not know which one is which. He has a similar problem with samples C and
D. One is from the Red Sea, and the other is from the Baltic Sea. Applying your
knowledge of ocean salinity, how would you identify the location of each
sample? How were you able to figure this out?