a. Gravity: density (increases/decreases) with increased altitude. b. Pressure gradient force: air moves from areas of (higher/lower) barometric pressure to areas of (higher/lower) barometric pressure. c. Coriolis force: a deflective force making wind that travels in a straight path appear to be deflected in relation to Earth's rotating surface. In the Northern Hemisphere, Coriolis deflects winds to the (right/left) and in the Southern Hemisphere, it deflects winds to the (right/left). d. Friction force: a force that drags on the wind as it moves across surfaces. Friction (increases/decreases) with increased surface texture and it (increases/decreases) with height above the surface