Writing Academic English 4th Edition

HowFertileLandBecomesDesert

Thereis nogoodsoiltogrowcropsin.

Thetopsoilwashesawayduringheavyrains.

Thetopsoilwashesawayduringheavyrains.

Thefollowingshortessaydescribesa simplechainreaction.

Thetreerootsdonotholdthesoilinplace.

Peoplemovetonewareasandclearlandforagriculturebycuttingdowntrees.

Thereis nogoodsoiltogrowcropsin.

Peoplemoveintonewareasandclearlandforagriculturebycuttingdowntrees.

Thetreerootsnolongerholdthesoilinplace.

Chapter 6 I Cause/Effect"Essays 99

SAD

1 Yearsago,medicalresearchersidentifieda psych

theyappropriatelynamedSeasonalAffectiveDisorder,

sufferfromSADbecomeverydepressedduringth

understandthecausesofthiscondition,whichaff

particula.rlyinareasofthefarnorthwherewinternlg

ofdaylightarefew.· •.

2 SADresultsfroma.decreaseintheamountof..

Doctorsknowthatdecreasedsunlightincreasesthe

a sleep-related·hormonethatis producedatincrease

Therefore,whenthedaysareshorteranddarker,.

hormoneincreases.Shorter,darkerdaysalso.decrea

a chemicalthathelpstransmitnerveimpulses.Lack.

bea causeofdepression("Seasonal"HH,par.1).1.De... ionma from

theresultingimbalanceofthesetwosubstancesinthebody.Also,doctors

believethata decreaseintheamountofsunlightthebodyreceivesmaycause

a disturbanceinthebody'snaturalclock("Seasonfl.l"NMHA,par.2).1Doctors

believethatthecombinationofchemicalimbalanceandbiologicalclock

disturbanceresultsin symptomssuchaslethargy,3oversleeping,weightgain,

anxiety,andirritability-allsignsofdepression.

3 Sinceabsenceoflightseemstobethecauseofthisdisorder,a daily

doseoflightappearstobethecure.DoctorsadviseJ:?atientstositinfront

I"SeasonalAffectiveDisorder."TheHealthyHouseLtd. 30 Nov. 2004 <http://www.healthy-house.co.uk/

aJIergy/infonnation.php?aIIergy-id=l1>.

z"SeasonalAffectiveDisorder."NationalMentalHealthAssociation. 30 Nov. 2004 <http://www.nrnha.org/

infoctr/factsheets/27.cfrn>.

3lethargy:inactivity;tiredness

Cause

J-

Effect

J-

Cause

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Effect

J-

Cause

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Effect

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Cause

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Effect

Conclusion

Introduction

MODEl.

Cause/Effect
Essay(Chain
Organization)