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 slight relax of air where cold was
And water trickles ...”
—Philip Larkin (1922–1986)
“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)
“The night was thick and hazy
When the “Piccadilly Daisy”
Carried down the crew and captain in the sea;
And I think the water downed ‘em;
For they never, never found ‘em,
And I know they didn’t come ashore with me.”
—Charles Edward Carryl (1841–1920)