Iplanethi yethu iningi lakhiwe ngamanzi, ahlukaniswe abe izilwandle. Amanzi amakhulu, amakhulu abangela ukuphila emhlabeni njengoba siwazi namuhla. Konke izilwandle zomhlaba zinezici ezihlukile yingakho zihlukaniswa ngamagama ahlukene. Ngamunye wabo ugcina inani elihlukile lokuhlukahlukana ngokwezimo zawo.
Kulesi sihloko sizokutshela konke odinga ukukwazi ngezilwandle zomhlaba kanye nezici zazo.
Luyini ulwandle
Okokuqala kunakho konke ukwazi ukuthi yini ulwandle ukuze ukwazi ukwazi ukuthi yiziphi izinhlobo ezahlukahlukene ezikhona emhlabeni. Uma sisho igama elithi ulwandle, silixhumanisa nenani elikhulu lamanzi elimboza izindawo ezinde zomhlaba. Akunasilinganiso esiqondile sokulinganisa izilwandle. Siyazi nje ukuthi banokwandiswa okuhle, ngokuba iningi lomhlaba. Uma sikhuluma ngeplanethi yomhlaba, siyabona ukuthi besingayihlukanisa kuphela sibe ngumzimba omkhulu wamanzi anosawoti. Kodwa-ke, njengoba izici zihlukile endaweni ngayinye emhlabeni, zihlukaniswe ngezinhlobo ezahlukahlukene.
Iphuzu lokuhlukanisa amanzi amaningi amboze iplanethi yethu ngezinhlobo ezahlukene kulula ukufunda ngokujulile. Ukuze uqonde kangcono ukuthi lezi zidumbu zamanzi zakhiwe kanjani, ungafunda mayelana ukwakheka kwezilwandle kanye nokubaluleka kwe izilwandle nezilwandle ebhalansi yeplanethi. Ngaphezu kwalokho, kubalulekile ukwazi ukufudumala kolwandle kanye nomthelela wayo endaweni ezungezile.
Izilwandle zomhlaba
Sizokwazi ukuthi yiziphi izilwandle ezisemqoka emhlabeni ezinezimpawu zazo eziyinhloko:
- I-Pacific Ocean: Inkulu kunazo zonke futhi inamanzi ayi-714 cubic kilometres amanzi. Njalo ngonyaka kuncishiswa isentimitha elilodwa ngenxa yokuhamba kwamapuleti we-tectonic. Noma kunjalo, kuselulwandle olukhulu kunawo wonke emhlabeni. Amaphuzu ajulile emhlabeni atholakele kulo mzimba omkhulu wamanzi. Phakathi kwabo sinekholi UMariana Trench.
- I-Atlantic Ocean: Incane kuneyangaphambili, ikala ngaphezudlwana kwengxenye. Kodwa-ke, iyikhaya lamadiphozithi kawoyela amaningi futhi iwumzila obalulekile wokuxhumana phakathi kweYurophu neMelika. Elinye lamaqiniso anelukuluku kakhulu mayelana nalolu lwandle ukuthi lunosawoti omningi kakhulu, isici esihlobene nezimo zezulu eziningana e-.
- Indian Ocean: Ingowesithathu ngobukhulu ezilwandle emhlabeni futhi ihlanganisa u-19.5% wamanzi ewonke asemhlabeni. Igqama ngokuba nengcebo enkulu kawoyela negesi yemvelo. Lesi samba samafutha ezinto ezimbiwa phansi sikwazile ukuletha ingcebo enkulu kwezinye zezizwe zaseMpumalanga Ephakathi. Kufanele kukhulunywe ukuthi i- ukuncibilika kwe-Arctic kungase kuthinte ukuguquguquka kwalezi zilwandle.
- I-Arctic Ocean: Ibhekwa njengencane futhi ijulile kakhulu kuzo zonke. Nokho, iwulwandle olubanda kunazo zonke emhlabeni. Ukusingatha inani elikhulu lezilwane zasolwandle naphezu kwezimo ezimbi kakhulu. Ibe ngolunye lwezilwandle ezibaluleke kakhulu ekulinganiseni kwemvelo kwezinhlobo eziningi ezindaweni zokuhlala ezingasenyakatho. Ngenxa yalezi zimo zemvelo eziyingqayizivele, kutholakala inani elikhulu lezinhlobo ezitholakala kuphela. Kubalulekile ukutadisha imiphumela yeziphepho zesihlabathi kulesi sifunda.
- I-Antartic Ocean: Ingolunye lwezilwandle zokugcina ukuhlukaniswa abantu. Ibonakala ngokuba yiyona yodwa ezungeza izwekazi lonke. Lolu lwandle luyikhaya lezinhlobo zezilwane okungenani eziyi-10.000 futhi luqukethe ikhabhoni ephindwe izikhathi ezingama-50 kunomkhathi womhlaba, isihloko esihlobene izingozi ezibhekene ne-Antarctica.
Izici nokubaluleka kwezilwandle zomhlaba
Njengoba ingekho imingcele ebonakalayo noma imigoqo ehlukanisa ulwandle, imane imelelwa ngamamephu nezibalo zesikali. Lokhu kulula ukukuhlukanisa lapho ufunda izici ezahlukahlukene kanye nezinhlobonhlobo zezinto eziphilayo ezihlala endaweni ngayinye emhlabeni. Njengoba sishilo ngaphambili, i-Atlantic Ocean iwulwandle olunosawoti omningi kakhulu. Lokhu akusho ukuthi iyindikimba yamanzi ehlukile kuwo wonke umhlaba. Kodwa, njengoba iyindawo enosawoti nezinye izici, iyikhaya lezinye izinhlobo zezitshalo nezilwane. Ngakho-ke, ungaphila ngokuphelele le mizimba yamanzi ukuze ukwazi ukuyifunda ngokuzimela.
Ngalé kwamakhilomitha ambalwa amanzi azungeze ugu lwesizwe, akekho uhulumeni ongaba umnikazi wanoma yiluphi ulwandle. Isizwe ngasinye sikhululekile ukuhamba ngolwandle noma ngomoya ngokusebenzisa lezi zindawo zasemanzini. Kuze kube manje, kunemithethonqubo nemithetho elawula ukusetshenziswa nokuxhashazwa kwezilwandle ukuze kugcinwe ukulondolozwa nokusetshenziswa kwazo ngendlela eqhubekayo. Isici esibalulekile okufanele sikhumbule ukuthi izilwandle ziwumthombo obalulekile wezinto eziphilayo emhlabeni wethu, njengoba kushiwo ku Izinsuku Zolwandle Zomhlaba.
Izilwandle ziyizingcezu eziyisisekelo zeplanethi yethu. Uma befunda kuphela amanzi akhiwe kungaba yinto elula kakhulu, kepha kungukuthi ngaphakathi kunezinhlobo eziningi zokuphila futhi kuthathe abantu uhambo lomlando ukuwathola. Ngaphandle kwalokhu, nanamuhla akuzona zonke izinhlobo zezinto eziphilayo ezaziwayo ngoba isikhala sikhulu kakhulu. Kuzo zonke izilwandle zomhlaba, cishe ama-5% kuphela aziwa. Futhi ngukuthi ucwaningo kulezi zimvelo lumelela izindleko eziphezulu zezomnotho kanye nengozi enkulu kubaphenyi.
Kungashiwo ukuthi izilwandle zomhlaba ziyikudla kwezilwandle nemifula. Njengoba umuntu engenazo izici ezidingekayo ukuze akwazi ukufinyelela ekujuleni kolwandle olukhulu, ukusebenzisa imishini yezobuchwepheshe kubalulekile. Noma kunjalo, kunezingozi ezingaba khona zezingozi noma zokufa okungazelelwe. Lezi yizizathu ezenze ukuthi bakwazi ukudala amarobhothi akhethekile okutadisha izimbotshana, amagquma asolwandle nezindawo ezijulile lapho ukukhanya kungafinyeleli khona. Kulezi zindawo ingozi inkulu kakhulu. Futhi akulona uphenyo olungenziwa ngendlela elawulwayo ngoba ludinga izindleko eziphezulu zezomnotho kanye nokutshalwa kwezimali okuphezulu. Ngaphezu kwalokho, njengoba isikhala sokuphenya silinganiselwe kakhulu, amathuba okuthi okuthile okuhlukile kulokho osekuvele kwaziwa ngeke kutholakale.
Amazinga olwandle afundwe kakhulu aveze amaqiniso athe xaxa. Futhi izinhlobo ezahlukahlukene zokuphila zibekiwe ezincike ngokuphelele ezimeni zamanzi. Lezi zimo ikakhulukazi ukushisa, usawoti, ukuminyana, ingcindezi nokungcola. Ukungcoliswa kwamanzi Sekuyinkinga yomhlaba wonke ethinta kakhulu isici samakhemikhali samanzi. Ngale ndlela, izilwandle zomhlaba ezingcolisiwe zivimbela ukwakhiwa kwezinhlobo eziningi zokuphila ezisekela impilo yazo zonke izinto eziphilayo.
Ngiyethemba ukuthi ngalolu lwazi ungafunda kabanzi ngezilwandle zomhlaba kanye nezici zazo.