NarrativeNonfictionPAIREDREADHeliosandPhaetonbyHannahSperberPlanetPOWERAPhotographyCredit:RobertGlusic/CORBIS**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.STRATEGIES&SKILLSWordCount:1,369**ComprehensionStrategy:AskandAnswerQuestionsSkill:MainIdeaandKeyDetailsVocabularyStrategyLatinandGreekPrefixesVocabularycoincidence,consequences,consume,converted,efficient,incredible,installed,renewableContentStandardsScienceEarthScienceCopyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-118757-7MHID:0-02-118757-6PrintedintheUnitedStates.123456789QLM151413121110PAIREDREADIntroduction.............................2Chapter1ThePowerofWater.....................4Chapter2HeatfromtheInside.....................7Chapter3ThePoweroftheSun..................10Conclusion..............................14RespondtoReading....................15HeliosandPhaeton............16Glossary/Index..........................19FocusonScience...............20EssentialQuestionHowhaveourenergyresourceschangedovertheyears?byHannahSperberPlanetPOWERThinkstock/MasterfileIntroductionEnergyisincredible.Weuseittolightandheatourhomes.ItpowersourTVsandcomputers.Somuchofwhatwedodependsonenergy!Mostoftheenergyweconsumetodaycomesfromfossilfuels,suchasoil,gas,orcoal.Fossilfuelswereformedfromplantsandanimalsthatlivedmillionsofyearsago.Fossilfuelslieburieddeepundertheground.Burningfossilfuelsreleasestheirenergy.Burningfossilfuelssuchascoalpollutestheair.2LarryLeePhotography/CORBISIntheUnitedStates,giantwindfarmsproduceenoughelectricityforalmost9millionhomes.However,burningfossilfuelspollutesthe...
