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unit13thepropertiesofwater whyisitblue waterplanet whatcanwaterbeusedfor drink washclothes irrigation transport providelivingspaceformarinelife theyarefloatingonthesurfaceofdeadsea canyouexplainhowtheycandothis entertainment canyougivemesomewords phrasesorsentencesrelativetowater wherethereisariver thereisacity wherethereiswater thereislife 22nd march whatpropertiesorcharacteristicsdoyouknowaboutwater properties unit13thepropertiesofwater propertiesofwaterpara 1 chemicalstructurepara 2 salinitypara 3 densitypara 4 heatcapacitypara 5 oceanmotionpara 6 howisthetextorganized importanceofwaterpara 7 fastreading 1 waterhasarelativelylowfreezingpoint 2 youwilldrowninthedeadsea 3 waterisliquidatroomtemperature 4 saltwaterisheavierthanfreshwater 5 thedensityofwateris1 000kg m3 6 theoceanwillfreezetotally 7 thesalinityoftheearth soceansisabout3 5 8 whenwaterfreezes itsdensityincreases trueorfalse 1 thereareaboutfivebillionspeciesintheoceansrangingfromthetiniestplanktontogiantslikesharksandwhales 2 thewatermoleculeismadeoftwohydrogenatomsandoneoxygenatom f t 3 thereasonwhywatercandissolvemostsubstancesonearthisthatwaterhashighheatcapacity 4 waterisaliquidatroomtemperature andithasarelativelylowfreezingpoint 5 thesalinityoftheearth soceansisabout35 f f t 6 purewaterhasahigherfreezingpointandislighterthansaltwater 7 ifasubstancehasadensity800kg m3 itwillfloatonwater 8 whenwaterfreezes itsdensityincreases t f t 9 watergetssmallerwhenitfreezes 10 otherrecoursessuchasoil gas goldandsoon areaspreciousasadropofrain 11 themostimportantthingwecanlearnaboutwateristhatwemustprotectitanduseitwisely f f t introduction para1 whydowecallitanoceanplanet lifeontheearthbeganintheoceansaboutthreebillionyearsago 99 ofthelivingspaceonearthisintheoceans thereareaboutfivemillion known speciesintheoceans lifeintheoceansrangesfromtinyplanktontogiantsharksandwhales oceanisagreatplacetolive water whatiswatermadeupof themoleculeofwaterismadeupoftwohydrogenatomsandoneoxygenatom salinity para3 seawater saltwater dissolvedsolidsandgases purewater thesalinityoftheoceans thirty fivepartsperthousand 3 5 keypoints onekilogramme 35grammes thesalinityaffects and weight freezingpoint heavier lower heatcapacity para5 heatcapacity theamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade relativelyhigh water heat absorbandgiveoff createastableenvironmentsotheoceanisasafeandcomfortablehabitat whatdodifferentdensitiesintheoceanresultin waterintheoceanisalwaysmoving waves density para4 density mass volume relationship keypoints thedensityofpurewater 1 000kg m3 onecubicmetre 1 000kilogrammes marineanimalsandplantstakeadvantageofthedensityof
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