1.   Strong winds have churned up huge dust storms in southern California this week.

2.   As he lingers on the beach under an ominous sky, a stiff wind churns the sand into a diaphanous river.

3.   Large swells were spawned by a parade of low pressure systems whose stormy winds churned up the eastern Pacific Ocean over the course of the past several days.

4.   The very top of the lake is warmed by the sun, and the wind churns the water to distribute the heat.