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Chapter 2





               RISING


               TEMPERATURES,

               RISING SEAS









               When something gets hot, it gets bigger. Scientists call
               this thermal expansion. That is how a hot air balloon

                                                               blows up. Heat
                                                               makes the air in

                                                               the balloon expand.
                                                               The water in the

                                                               ocean is expanding
                                                               because of heat.
















                                               Thermal expansion happens in
                                              hot air balloons. The burners are
                                               lit to keep the air temperature
                                                 warm so it fills the balloon.




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