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                                                           Figure 8



                     4.    Refer to the illustration above and use the following terms to fill in the blanks below.

                            Some of the terms may be used more than once.

                          air               light                 sinks


                          warm              dense                 advection


                          cool              rises

                          a.   A warm or cool surface causes the ________________________above it to

                                become warm or cool.


                          b.   Warm air becomes _______________ ,cool air becomes ________________ .


                          c. Light air ________________________ ; dense air _______________________ .
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