Air on the move - windy weather in everyday life; using the wind - sailing boats and windmills; environment - sand dunes, wind erosion in deserts, plants - wind pollination, seed dispersal, air pressure - pressing forces and area, effects of air pressure; highs and lows - barometers, weather maps, wet and dry weather; measuring weather - wind speed and direction, Beaufort scale, wind socks, anemometers; forecasting weather - weather stations, satellites, computer prediction; world climate - weather all year round, seasons, monsoons, hurricanes; pollution - measuring air pollution, smog, greenhouse effect.