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transpiration the emission of water vapor from the leaves of plants condensation the act of increasing the density of something evaporation the process of becoming a vapor hydrosphere the portion of earth that is water water vapor water in the form of a gas surface tension a phenomenon at the surface of a liquid caused by intermolecular forces It evaporates what happens to water when it is heated? It turns solid what happens when it freezes? Evaporation Why do puddles disappear? 30 degrees About what Fahrenheit temperature would be good for ice skating? 80 degrees About what Fahrenheit temperature would be good for swimming? 60 degrees About what Fahrenheit temperature would be good for hiking? thermometer to measure heat, measuring instrument for measuring temperature anemometer a gauge for recording the speed and direction of wind barometer an instrument that measures air pressure hygrometer an instrument for measuring humidity rain gauge instrument used to measure rainfall ice what is it called when water is solid? water vapor what is it called when water turns to gas? water what is it called when water is liquid? water supply with water, as with channels or ditches or streams