ExpositoryTextThreatsOceanbyKenBennPAIREDREADFloatingTrashSTRATEGIES&SKILLSPhotographyCredit:DigitalVision/GettyImages**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.AWordCount:2,394**ComprehensionStrategy:AskandAnswerQuestionsSkill:CompareandContrastVocabularyStrategyParagraphCluesVocabularyatmosphere,decay,gradual,impact,noticeably,receding,stability,variationsContentStandardsScienceEarthandSpaceScienceCopyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-119096-6MHID:0-02-119096-8PrintedintheUnitedStates.123456789DOC151413121110PAIREDREADIntroduction..................................2Chapter1WhatAreAlgae?...............................4Chapter2WhatCausesAlgalBlooms?.....................8Chapter3WhyShouldWeBeConcerned?.................12Conclusion...................................16RespondtoReading...........................18FloatingTrash......................19Glossary.....................................22Index........................................23FocusonScience.....................24byKenBennThreatsOceanEssentialQuestionWhatchangesintheenvironmentaffectlivingthings?IntroductionDidyouknowthatnearlythree-quartersofourplanetiscoveredinwater?Earth’srivers,lakes,andoceanssupportmanylivingorganisms.Algaearesomeofthemostwidespreadofaquaticlifeforms.Althoughmostalgaeneedmoisture,someevenliveindesertsand.Algaearesimpleplant-likeorganisms,andtherearethousandsofdifferentspecies.Scientistsclassifythemintodifferentgroupsaccordingtocolor,structure,andhabitat.Thesmallestspeciesofalgaearetinyplanktonjust0.00004ofaninchlong,whilethelargest...
