Wind is invisible, but watchful students can see how air in motion be detected by movement around them. This simple book introduces the different intensities of the wind, from gentle breezes that make flags flutter to powerful tornadoes that can lift a house. As the book progresses, readers discover how wind intensities can be measured, and they indirectly become acquainted with the Beaufort Wind Scale used by meteorologists. Throughout the book, the text flows like poetry, moving young readers along as easily as the wind makes little boats sail across the water. How Does the Wind Blow? is part of the I Wonder Why book series, written to ignite the curiosity of children in grades K-6 while encouraging them to become avid readers. These books explore the marvels of geology, land forms, weather, environments, and other phenomena related to science and nature. Included in each volume is a Parent/Teacher Handbook with coordinating activities. The I Wonder Why series is written by an award-winning science educator and published by NSTA Kids, a division of NSTA Press.