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 engamamitha angu-7-10 ububanzi iyowela phezu komhlaba, okubangela ukuqhuma okukhulu, njengokuphonsa uthuli oluningi emkhathini ukuze kwakhiwe iZhetianbiri House of Sand and Fog, okuholela e- ukumiswa kwe-photosynthesis yezitshalo , Ngakho-ke ukushabalala kwama-dinosaurs.I-Asteroid impact theory ngokushesha yathola 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 ngembangela yokushabalala kwama-dinosaur kuye kwaba nezimo ezingaphansi kweshumi nambili, ingcebo eyengeziwe eya emangalisa futhi ejabulisayo, "kusho ukushayisana kwe-meteorite," kodwa kungenye yazo. "Ukungqubuzana kwe-meteorite", ukushabalala kwama-dinosaurs ephuzwini elikhulu lokubuka kukhona okulandelayo:Okokuqala, ukuguquka kwesimo sezulu, kusho.Eminyakeni eyizigidi ezingu-6500 edlule, isimo sezulu soMhlaba sishintsha ngokuzumayo izinga lokushisa lehla, okuholela ekwehleni kwe-oxygen emkhathini ukuze ama-dinosaur angakwazi ukuphila.Kwaphinde kwasikiselwa ukuthi izibankwakazi zinegazi elibandayo, kodwa azinazinwele noma isitho esifudumele futhi angakwazi ukuphila. hhayi ukuzivumelanisa lokushisa Emhlabeni lehla, zase iqhwa ukufa.
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 imikhakha ethile yebhayoloji nekazibuthe ehlobene nokufa.Ukuzwela kakhulu kukazibuthe wesayensi yezinto eziphilayo, ekushintsheni kukazibuthe woMhlaba, kungase kuholele ekuqothulweni. Ngakho-ke kubonakala sengathi ukushabalala kwama-dinosaurs kungase kuhlobene nezinguquko insimu kazibuthe yomhlaba.V. uthe angiosperm poisoning.Ekupheleni kwenkathi ye-dinosaur, ama-gymnosperms oMhlaba anyamalala kancane kancane, esikhundleni salokho inani elikhulu lama-angiosperm, ama-gymnosperms aqukethe lezi zitshalo azikho esimweni esinobuthi sokudla okungavamile kwe-dinosaur, ukutholakala kwenani elikhulu lama-angiosperms kwaholela ekuqoqweni kobuthi umzimba Kakhulu, ekugcineni ubuthi.Six, wathi imvula acid.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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