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:
“Oh, a friend! How true is that old saying, that the enjoyment of one is sweeter and more necessary than that of the elements of water and fire!”
—Michel de Montaigne (1533–1592)
“It may be that through habit these do best,
Coming to water clumsily undressed
Yearly; teaching their children by a sort
Of clowning; helping the old, too, as they ought.”
—Philip Larkin (1922–1986)
“I asked, “What happens, father, when you die?”
He told where all the running water goes,
And dressed me gently in my little clothes.”
—Robert Pack (b. 1929)