G D For Dad L.D. To all children they're our future M.G. Special thanks to Sandra Harris Executive Director the American Windmill Museum
IT IS A POWERFUL FORCE YOU CAN'T SEE It can turn your umbrella inside out It can keep a kite up in the air It can blow rooftops off buildings or help plants spread their seeds What is it Wind 3
4 Wind is moving air The air around the Earth is heated by the sun but not evenly Warm air tends to rise It leaves a space and cooler air moves in to fill it This movement of air is happening somewhere on Earth all the time This is wind WARM AIR RISING
Sometimes wind is a gentle breeze Sometimes it is very fast and strong COOL FALLING AIR 5
