PAIREDREADSavingEnergyExpositoryTextbyVanessaYorkSTRATEGIES&SKILLSAPhotographyCredit:CoverEarthraceConservation.**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.Wordcount:800**ComprehensionStrategy:AskandAnswerQuestionsSkill:CauseandEffectVocabularyStrategyHomophonesVocabularyenergy,natural,pollution,produce,renewable,replace,sources,traditionalContentStandardsScienceEarthandSpaceScienceCopyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-118829-1MHID:0-02-118829-7PrintedintheUnitedStates.123456789DOC151413121110PAIREDREADIntroduction..........................2Chapter1Biofuels...............................4Chapter2HydrogenFuel........................11Conclusion...........................14RespondtoReading.................15SavingEnergy...............16Glossary/Index.......................19FocusonScience.............20byVanessaYorkEssentialQuestionWhataredifferentkindsofenergy?IntroductionFuelisanymaterialthatstoresenergythatcanbeextractedandthenused.Weusefueltoruncars,trucks,andmachines.Wealsousefueltomakeelectricity.Weusegasolinetofuelourcars.2BananaStock/PunchStockPeoplehaveusedfossilfuels,suchascoal,naturalgas,andoil,foralongtime.Wefindthesefuelsintheground.Butthereareproblemswithfossilfuels.Fossilfuelscausepollution.Theyalsoproducegreenhousegases.Somescientiststhinkthatgreenhousegasesmaycauseglobalwarming.Wearealsorunningoutoffossilfuels.Scientistsarelookingforthefuelsofthefuture.Manytrucksrunondieselfuel.3TheMcGraw-HillCompanies,Inc./JohnThoeming,photographerCHAPTER1BiofuelsBiofuelisarenewablefuel.Itismadefromplants.Biofuelcan...
