Water
A steep density gradient in a body of water can have the effect of trapping energy and preventing convection, such a gradient is employed in solar ponds. In the case of salt water, sharp gradients can lead to stratification of different concentrations of salinity. This is called a Halocline.
Read more about this topic: Density Gradient
Famous quotes containing the word water:
“A single monk carries his own bucket of water; two monks carry their bucket of water together; but when there are three monks, there is no water at all.”
—Chinese proverb.
“The favor of a drop of water should be repaid as an overflowing spring.”
—Chinese proverb.
“Because of neglect, Son,
though well-forged
in affectionate bonds,
Love in time
will trickle away
like water through cupped hands.”
—Hla Stavhana (c. 50 A.D.)