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:
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—Henri-Frédéric Amiel (1821–1881)
“—the main jet
Struggling aloft unti it seems at rest
In the act of rising, until
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—Richard Wilbur (b. 1921)
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—Raymond Chandler (1888–1959)