Unit13integratingskills课件
日期:2010-02-18 02:44
Welcome!Unit13TheWaterPlanetIntegratingskillsNature’sNursery:Estuaries玉壶中学程畅ChemicalStructure1H2O=2H+OThewatermoleculeismadeupoftwoHydrogenatomsandoneOxygenatomThewaythewatermoleculeisformedgiveswateruniquepropertiesTheChemicalStructureofwatermakesitdifferentfromalmosteverythingelseonearthRevisionReadthethreeparagraphandfinishthechartbelowDensityistherelationshipbetweenmassandvolumeHowmuchdissolvedsolidsandgasescontainedinonekilogrammeofwaterSaltwaterhasalowerfreezingpointandisheavierthanpurewaterThedensityofwaterhelpssmallcreaturesFloataroundtheoceanandbecausethedensitydecreaseswhenitfreeze,theoceansneverfreezetotallyHeatcapacityistheamountofenergyittakestoraisethetemperatureofasubstanceonedegreecentigradeTheheatcapacityofwaterkeepstheoceansatasteadytemperature,whichmakesitgoodplacetoliveforcreaturesthataresensitivetosuddenchangesintemperatureThewaterintheoceansalsokeepsthetemperatureoftheearthsteadyRiverOceanEstuaryEstuaryAne,
查看全部