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:
“If water is too clear, it will not contain fish; people who are too cautious will never gain wisdom.”
—Chinese proverb.
“What did it matter where you lay once you were dead? In a dirty sump or in a marble tower on top of a high hill? You were dead, you were sleeping the big sleep, you were not bothered by things like that. Oil and water were the same as wind and air to you.”
—Raymond Chandler (1888–1959)
“Dying smokers sense
Walking towards them through some dappled park
As if on water that unfocused she
No match lit up, nor drag ever brought near....”
—Philip Larkin (1922–1986)