7. The.. of rain dependson the. .and the of tiny droplets of water vapour in the cloud. (form/condense/combine) 8. When the droplets are heavy enough to fall, can take place. (precipate) 9. The.. .and. of water can be observed in everyday life. (evaporate/condense) 10. The. ... of ice to water and water vapour by heating is a good. of the change of state of matter. (convert/illustrate) 11. The of calcium compound makes water hard(contain)