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water vapor

the invisible, gaseous form of water


water that fills the cracks and pores in underground soil and rock layers


smallest particle of an element that has the characteristics of that element; basic building block of all matter


a substance made up of only one kind of atom


two or more elements that are chemically combined

polar molecule

a molecule that has electrically charged areas

surface tension

the tightness across the surface of water that is caused by the polar molecules pulling on each other

capillary action

the combined force of attraction among water molecules and with the molecules of surrounding materials


a mixture that forms when one substance dissolves another


a substance that dissolves another substance, forming a solution


is a form of matter; solid, liquid, or gas


state of matter with a definite shape and volume


state of matter that has no definite shape but has a definite volume


state of matter with no definite shape or volume


occurs when matter changes from its solid to its liquid state


occurs when matter changes from a liquid to a gas throughout the entire sample


occurs when molecules at the surface of a substance change from a liquid to a gas state


occurs when a gas changes into a liquid state


occurs when a liquid changes into a solid state

water cycle

a continuous process by which water moves through the living and nonliving parts of the environment


the process by which plants release water vapor through their leaves


water that falls to Earth as rain, snow, sleet, or hail

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