What makes a tornado twist?

Sinopse

"Is each snowflake unique? What comes first: thunder or lightning? What causes the seasons? Whatever the weather question a child has--from sunshine to storms or snow--the fascinating answers are right here!"-- Text in question-and-answer format provides answers to interesting weather questions, such as why the Amazon is hotter than the North Pole, what makes a rainbow, why do clouds float, and many more.