Matching Pairs Earth's Water Vocabulary MatchOnline version Match the words from our book Earth's Water. by Beth Prather 1 evaporation 2 invisable 3 condensation 4 solid 5 polluted 6 gas 7 liquid 8 precipitation 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) water that falls to the ground such as, hail, sleet, rain or snow 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. unable to be seen having a firm or hard form or shape