This worksheet, called 'Weather Worksheet: Billy and Maria Learn About Tornado Safety - Part 1', was kindly presented by National Weather Service and can also be downloaded from their website. This is a 13-page worksheet from 'Billy and Maria' series, and it presents the first out of three chapters dedicated to tornadoes, how they are formed and how to stay safe. The worksheet is a good source of the topic-related vocabulary and tornado forming process description. Students are encouraged to brainstorm on their own safety ideas, in addition to those basic ones provided in the worksheet as part of what Billy and Maria learned from their teacher. As other worksheets in this series, this one is also supplied with some facts about the National Oceanic and Atmospheric Administration, National Weather Service and National Severe Storms Laboratory, as well as their responsibilities and mission statements. The last page of the worksheet is the index of titles for 'Billy and Maria' series.