Memory Water cycleVersion en ligne Match the word with its meaning. par Annalisa Farrugia Transpiration The critical temperature at which air becomes saturated. When water vapour changes back to water droplets. The boundary between two air masses. Dew point A solid surface such as dust, over which condensation occurs. Evaporation A type of rainfall that occurs when air rises as it is heated by the hot ground below. Hygroscopic nuclei Convectional rainfall A type of rainfall that occurs when a warm airmass meets a cold airmass. Front Any form in which water falls from the sky. Precipitation The loss of water from vegetation. The loss of moisture from water surfaces and the soil. The movement of water between air, sea and land. Frontal rainfall Water cycle Condensation Relief rainfall A type of rainfall that occurs when warm air meets a mountain.