Meteorology 1)[fill in the blank] the counterclockwise winds associated with northern hemisphere midlatitude play a significant role in the movement of air masses, transporting warm moist air northward ahead of a low while dragging colder, drier air southward behind it. 2) fog uses nets placed perpendicular to prevailing winds that act as condensation nuclei for condensing and collecting water droplets from fog. 3) an fan is a fan shaped discharge of sediment and debris, usually caused by a sudden and intense downpour of rain, which flows quickly over changes (breaks, gulch, etc.) in topography. 4) [true/false] potential causes for variations in the size of ozone holes at both poles, include: a. the natural chemical reactions responsible for the production and destruction of ozone in the stratosphere (middle atmosphere) b. the seasonal variations in incident sunlight on the planet c. "special" features of polar weather that isolates this region of the atmosphere from the rest of the planet during part of the year. d. the addition to the atmosphere of ozone depleting chemicals through human activities the presence of "active surfaces" in the polar stratosphere upon which ozone destruction reactions can be enhanced. this includes volcanic aerosols and polar stratospheric clouds.