Water

　　Alllivingthingsneedwater．Fishesliveinwater．Weneedwatertodrinkanduse．Animalsandplantsneedwater,too．Therearetwokindsofwater—seawaterandfreshwater．Seawaterissaltyandwecannotdrinkit．Wedrinkfreshwater．

　　Waterisaninterestingthing．Whenweboilwater,itwillturnintosteam．Ifweputapieceofglassoverthesteam,itwillcooldownandturnbackintowaterdrops．Ifweputsomewaterintoafreezer,itwillfreezeandturnintoice．Butwhenwetakeouttheiceandplaceitonatableforsometime,itwillmeltandbecomewateragain．

　　Ifwedropacoinintoaglassofwater,itwillsinktothebottom．Butwhenweputamatchintoit,thematchwillnotsink．Itwillfloatonthesurface．WhathappenswhenyouswimDoyoufloatorsink?