Mayelana nezizathu zokushabalala kwama-dinosaurs, kusacwaningwa. Isikhathi eside, umbono ogunyazwe kakhulu, kanye nokushabalala kwama-dinosaurs eminyakeni engu-6500 edlule mayelana ne-meteorite enkulu. Ngokusho kocwaningo, kwakukhona i-asteroid engu-7-10 ububanzi bayowela ebusweni bomhlaba, okubangela ukuqhuma okukhulu, njengokuphonsa uthuli oluningi emkhathini ukuze kwakhiwe iZhetianbiri House of Sand and Fog, kwaholela ekumisweni kwe-photosynthesis yezitshalo , Ngakho-ke ukushabalala kwama-dinosaurs.Inkolelo-mbono yomthelela we-Asteroid yathola ngokushesha ukusekelwa kososayensi abaningi. Ngo-1991, eYucatan Peninsula yaseMexico kwenzeka ekutholakaleni kwesikhathi eside se-meteorite impact craters, iqiniso liwubufakazi obengeziwe baleli phuzu lokubuka. Namuhla, lo mbono ubonakala usuyisiphetho.
Kodwa kukhona futhi abantu abaningi ngomthelela onjalo we-asteroid kulabo abangabazayo, ngoba iqiniso liwukuthi: amaxoxo, izingwenya nezinye eziningi ezibucayi kakhulu ekushiseni kwezilwane ziye zamelana futhi zasinda eCretaceous. Lo mbono awukwazi ukuchaza ukuthi kungani ama-dinosaurs kuphela afa. Kuze kube manje, ososayensi baye babeka phambili imbangela yokuqothulwa kwama-dinosaurs ayengekho ngaphansi kwezimo eziyishumi nambili, ingcebo eyengeziwe kuya ephawulekayo futhi ejabulisayo, "kusho ukungqubuzana kwe-meteorite," kodwa ingenye yazo.Ngaphezu kokuthi "ukushayisana kwe-meteorite", ukushabalala kwama-dinosaurs endaweni eyinhloko yokubuka kukhona ukuguquka kwesimo sezulu, okokuqala: Eminyakeni eyizigidi ezingu-6500 edlule, isimo sezulu eMhlabeni ngokuzumayo lishintsha izinga lokushisa lehla, okuholela ukuncipha komoyampilo emkhathini ukuze izibankwakazi ayikwazanga ukusinda.Kwaphinde kwasikiselwa ukuthi izibankwakazi kukhona abandayo-negazi, kodwa kungabikho izinwele noma isitho efudumele futhi abakwazi ukuzivumelanisa nezinga lokushisa Umhlaba lehla, base iqhwa ekufeni of.
Okwesibili, uhlobo, wathi ukulwa. Ekupheleni kwenkathi ye-dinosaur, yaqala ukubonakala ezilwaneni ezincelisayo ezincane, lezi zilwane ziyizilwane ezidla amagundane zingase zidle amaqanda.Ngenxa yalokhu kuntuleka kwezilwane ezincane ezidla ezinye izilwane, eziningi futhi ekugcineni zidle amaqanda.
Okwesithathu, i-continental drift, kusho. Ucwaningo lwe-Geology lubonisa ukuthi ukusinda kwama-dinosaurs eminyakeni yobudala kuwukuphela kwesiqephu sezwe, okungukuthi, "i-Pangea." Ngenxa yezinguquko kuqweqwe lomhlaba, izwekazi lenzeka endaweni yeJurassic yokuhlukana okukhulu nokukhukhuleka, okuholela emvelweni nasekushintsheni kwesimo sezulu, ngakho-ke ukushabalala kwama-dinosaurs.
Okwesine, izinguquko ku-geomagnetic zathi. Isayensi yezinto eziphilayo yanamuhla ibonisa ukuthi izindawo ezithile zebhayoloji kanye nezikazibuthe ezihlobene nokufa.Ukuzwela kakhulu kukazibuthe wesayensi yezinto eziphilayo, ekushintsheni kozibuthe woMhlaba, kungase kuholele ekuqothulweni.Kubonakala sengathi ukushabalala kwama-dinosaurs kungase kuhlobene nezinguquko emkhakheni kazibuthe woMhlaba. V. uthe i-angiosperm poisoning. Ekupheleni kwenkathi ye-dinosaur, ama-gymnosperms oMhlaba anyamalala kancane kancane, esikhundleni salokho inani elikhulu lama-angiosperms, ama-gymnosperms aqukethe lezi zitshalo azikho esimweni esinobuthi se-dinosaur enkulu yokudla okungavamile, ukuthatha inani elikhulu lama-angiosperms kwaholela ekuqoqweni kobuthi emzimbeni Kakhulu, ekugcineni imvula.Isithupha, kusho i-asidi. Isikhathi se-Cretaceous sekwephuzile kungenzeka ukuthi sasingaphansi kwemvula ene-asidi enamandla, inhlabathi, okuhlanganisa ku-trace element strontium, zingancibilika izibankwakazi ngamanzi okuphuza nokudla, ngokuqondile noma ngokungaqondile, ukungenisa kwe-strontium, ubuthi obunzima noma obungapheli, amaqembu okugcina abafileyo.
Izizathu zokushabalala kwama-dinosaurs emcabangweni wokuthi lokhu okubalulwe ngenhla kuningi kakhulu kunalezi. Kodwa le mibono eshiwo ngenhla emphakathini wesayensi inabasekeli abaningi.Yiqiniso, ngayinye yalokhu okungenhla, kunendawo engaphelele. Isibonelo, "ukuguquka kwesimo sezulu" akucacisi izimbangela zokuguquka kwesimo sezulu. Ngemva kokuhlolwa, amanye ama-dinosaur amancane e-Coelurosauria, anesikhathi esanele sokulwa nezilwane ezincelisayo ezincane, ngakho "izinhlobo zezilwane zilwela ukusho" kunezintuba. Ku-geology yesimanje, "ithiyori ye-continental drift" ngokwayo iseyinkolelo-mbono."Ubuthi be-angiosperms" kanye "nemvula ene-asidi" ukuntuleka okufanayo kobufakazi obanele. Ngenxa yalokho, imbangela yangempela yokushabalala kwama-dinosaurs, abakayihloli ngokuqhubekayo.
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