WaterWaterisveryimportantforlivingthings.Withoutwatertherecanbenolifeonearth.Allanimalsandplantsneedwater.Manalsoneedswater.Waterisfoundatmosteverywhere.Eveninthedriestpartoftheworldthereissomewaterintheair.Asweallhavefoundout,watermaybeasolid,oraliquidoragas.Whenitisasolid,itmaybeashardasbrick,Whenitisaliquid,youcanpouritoutofacontainer.Whenitisagas,youcannotseeorfeelit.Althoughabout70percentoftheearth’ssurfaceiscoveredwithwater,therearemanyplacesintheworldstillrunningoutofwater.Soweshouldmakegooduseofwateronearth.水水对生物很重要,没有水,地球上就没有生命.所有的动植物都需要水.人类也需要水.水几乎无处不在.即使在世界上最干燥的地方,空气中也有水.水,正如你所了解的,有固态、液态和气态.当它是固态时,它可以像砖一样硬;当它是液态时,你可以将它从容器中倒出;当它是气态时,你看不见或感觉不到它