Show Causes of Rainfall The weather bureau says that condensation conn con centers or nuclei are arc essential es cs- es- es to the formation of clouds and therefore of rainfall These nuclei may be dust particles especially especIally especially espe espe- of certain kinds such as sea salt or even en It Is believed molecules molecules mole mole- cules cutes of ot certain sorts that have great at affinity as we sa say for water The TheaIr Theair Theair air always contains an abundance of such nuclei |