the amount of matter in a given space or volume

can be observed or measured without changing the identity of the matter

describes how a substance can be changed into a new substance with different properties

alters the substance but does not change it's identity

causes the substance to change into a new substance with different properties

the continuous movement of water between the Earth and its atmosphere

liquid water changes into water vapor and enters the atmosphere

water vapor cools and changes into water droplets and forms clouds

rain, sleet, snow or hail that falls from clouds to Earth

water that flows across the land and enters rivers, streams, lakes, and the ocean

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