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:
“But the beggar gazes on calamity
And thereafter he belongs to it, to bread
Hard found, and water tasting of misery.”
—Wallace Stevens (1879–1955)
“But sound of water over a rock
Where the hermit-thrush sings in the pine trees
Drip drop drip drop drop drop drop
But there is no water”
—T.S. (Thomas Stearns)
“Iron which is not whetted will grow rusty; water which does not flow will become stagnant.”
—Chinese proverb.