Matching Pairs Earth's Water Vocabulary MatchOnline version Match the words from our book Earth's Water. by Beth Prather 1 invisable 2 solid 3 polluted 4 condensation 5 liquid 6 evaporation 7 gas 8 precipitation water that falls to the ground such as, hail, sleet, rain or snow matter that can freely change shape and size; often it can't be seen. made dirty or harmful able to flow and change shape while keeping its size. When liquid changes to a gas (i.e. boiling water changes to steam on the stove) having a firm or hard form or shape unable to be seen water vapor (water in its gas form) turns into liquid. You may see this change on the outside of a cold glass cup, the warm side of windows, and in the clouds up in the air.