ExpositoryTextPAIREDREADSavingEnergybyVanessaYorkSTRATEGIES&SKILLSAComprehensionStrategy:AskandAnswerQuestionsSkill:CauseandEffectVocabularyStrategyHomophonesVocabularyenergy,natural,pollution,produce,renewable,replace,sources,traditionalContentStandardsScienceEarthandSpaceSciencePhotographyCredit:CoverEarthraceConservation.**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.Wordcount:1,262**Copyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-118902-1MHID:0-02-118902-1PrintedintheUnitedStates.123456789DOC151413121110PAIREDREADIntroduction.............................2Chapter1Biofuels..................................4Chapter2HydrogenFuel...........................11Conclusion..............................14RespondtoReading....................15SavingEnergy.................16Glossary/Index..........................19FocusonScience...............20EssentialQuestionWhataredifferentkindsofenergy?byVanessaYorkIntroductionFuelisanymaterialthatstoresenergythatcanbeextractedandthenused.Woodwasprobablythefirstfuelthatpeopleused.Theenergyofthewoodwasextractedbyfire.Today,weusefueltorunvehicles,machines,andappliances.Wealsouseittomakeelectricity.Weneedfueltohelpusgetaround.2BananaStock/PunchStockPeoplehavebeenusingfossilfuels,suchascoal,naturalgas,andoilforhundredsofyears.Thesearefuelsthatwefindintheearth.Buttherearesomebigproblemswiththem.Fossilfuelscausepollution.Theyalsoproducegreenhousegases,suchascarbondioxide.Greenhousegasesactliketheroofofagreenhouse,trappingheatinEarth’satmosphere.Somescientiststhinkthattheincreaseingreenhousegasesmaybeca...
