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:
“—the main jet
Struggling aloft unti it seems at rest
In the act of rising, until
The very wish of water is reversed,”
—Richard Wilbur (b. 1921)
“When the water of a place is bad it is safest to drink none that has not been filtered through either the berry of a grape, or else a tub of malt. These are the most reliable filters yet invented.”
—Samuel Butler (1835–1902)
“I’d take off all my clothes
& cross the damp cold lawn & down the bluff
into the terrible water & walk forever
under it out toward the island.”
—John Berryman (1914–1972)