ThreatsOceanbyKenBennPAIREDREADFloatingTrashExpositoryTextSTRATEGIES&SKILLSPhotographyCredit:DigitalVision/GettyImages**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.AComprehensionStrategy:AskandAnswerQuestionsSkill:CompareandContrastVocabularyStrategyParagraphCluesVocabularyatmosphere,decay,gradual,impact,noticeably,recede,stability,variationsELLVocabularyavailability,cope,exposed,taintedContentStandardsScienceEarthandSpaceScienceWordCount:1,525**Copyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-119140-6MHID:0-02-119140-9PrintedintheUnitedStates.123456789DOC151413121110PAIREDREADEssentialQuestionWhatchangesintheenvironmentaffectlivingthings?Introduction..................................2Chapter1WhatAreAlgae?..............................4Chapter2WhatCausesAlgalBlooms?....................8Chapter3WhyShouldWeBeConcerned?...............12Conclusion...................................16RespondtoReading..........................18FloatingTrash.....................19Glossary.....................................22Index........................................23FocusonScience....................24byKenBennThreatsOceanIntroductionAlgaearesimpleplant-likeorganismsthatusuallyliveinrivers,lakes,andoceansallovertheworld.Algaevaryinsize.Somealgaearetinyplankton,andsomearehugeseaweedsthataremorethan200feetlong.Manytypesofalgaeareharmlesstohumansandtheenvironment,butsomealgaecanbedangerous.Ifthealgaepopulationinanareagetstoolarge,thealgaecanchangethatareasothatnothingelsecanlivethere.Analgalbloomiscoveringpartofthisriver.2DonJohnston/agefotostock/...
