This program explores the mechanics of measuring wind speed and direction as well as the use of wind as an energy source. Students will also learn how wind occurs by finding out about the roles of temperature, air pressure and the sun. Graphics and animation will clearly illustrate these patterns. Students will also learn how hot-air balloons work in this exciting look at weather's invisible force. One of six volumes in the Weather Fundamentals DVD Series in the Schlessinger Science Library. Part of the Schlessinger Science Library in Action Collection. This title correlates to the National Science Education Standards for Earth and Space Science -- structure of Earth's system, Earth's history and Earth in the solar system. A Teacher's Guide is included and available online that features additional information on the topic, vocabulary words, discussion questions, follow-up activities and lists of recommended books & Internet resources. 23 minutes. Grades 4 to 7.