Ngokuphathelene nezizathu zokuqothulwa kwama-dinosaur, kusafundwa. Sekuyisikhathi eside, umbono onegunya kakhulu, kanye nokuqothulwa kwama-dinosaur eminyakeni engu-6500 eyedlule mayelana ne-meteorite enkulu. Ngokusho kocwaningo, kwakukhona i-asteroid engu-7-10 km ububanzi ezowela ebusweni bomhlaba, okubangela ukuqhuma okukhulu, njengokuphonsa uthuli oluningi emkhathini ukwakha i-Zhetianbiri House of Sand and Fog, okwaholela ekumisweni kwe-photosynthesis yezitshalo, futhi ngenxa yalokho ukuqothulwa kwama-dinosaur. Ithiyori yomthelela we-asteroid yasheshe yathola ukwesekwa ososayensi abaningi. Ngo-1991, e-Yucatan Peninsula yaseMexico kwenzeka ekutholakaleni kwesikhathi eside semigodi yomthelela we-meteorite, iqiniso liwubufakazi obengeziwe balo mbono. Namuhla, lo mbono ubonakala usube yisiphetho.
Kodwa futhi kunabantu abaningi ngenxa yomthelela onjalo we-asteroid kwabangabazayo, ngoba iqiniso liwukuthi: amaxoxo, izingwenya kanye nezinye eziningi ezizwela kakhulu ekushiseni kwezilwane ziye zamelana futhi zasinda eCretaceous. Lo mbono awukwazi ukuchaza ukuthi kungani ama-dinosaur kuphela afa. Kuze kube manje, ososayensi baye babeka phambili imbangela yokuqothulwa kwama-dinosaur bebengekho ngaphansi kwezimo eziyishumi nambili, ingcebo eyengeziwe kulokho okumangalisayo nokujabulisayo, "kusho ukungqubuzana kwe-meteorite," kodwa kungenye yazo. Ngaphezu "kokungqubuzana kwe-meteorite", ukushabalala kwama-dinosaur embonweni oyinhloko kukhona okulandelayo: Okokuqala, ukushintsha kwesimo sezulu, kusho. Eminyakeni eyizigidi ezingu-6500 edlule, isimo sezulu soMhlaba sishintsha ngokuzumayo ekushiseni kwehle, okwaholela ekunciphiseni umoya-mpilo emkhathini kangangokuthi ama-dinosaur awakwazanga ukusinda. Kwaphakanyiswa nokuthi ama-dinosaur anegazi elibandayo, kodwa engenazinwele noma isitho esifudumele futhi awakwazi ukuzivumelanisa nokushisa koMhlaba kwehle, kwaqandiswa kwaze kwaba sekufeni.
Okwesibili, lolu hlobo, kusho ukulwa. Ukuphela kwenkathi yamadayinaso, kwaqala ukuvela ezincelisayo ezincane, lezi zilwane zingase zidle amaqanda. Ngenxa yalokhu kuntuleka kwezilwane ezincane ezidla ezinye, amaqanda azo ayanda futhi ekugcineni adla kakhulu.
Okwesithathu, ukukhukhuleka kwezwekazi, kusho. Ucwaningo lwe-Geology lubonisa ukuthi ukusinda kwama-dinosaur ngesikhathi soMhlaba kuyingxenye yezwekazi kuphela, okungukuthi, "iPangea." Ngenxa yezinguquko oqweqweni lomhlaba, izwekazi lenzeka eJurassic yokuhlukana okukhulu nokukhukhuleka, okwaholela emvelweni nasekushintsheni kwesimo sezulu, ngakho-ke ukushabalala kwama-dinosaur.
Okwesine, izinguquko ku-geomagnetic zithi. I-biology yesimanje ikhombisa ukuthi amasimu athile e-biological kanye ne-magnetic ahlobene nokufa. Azwela kakhulu ensimini yamagnetic ye-biology, ezinguqukweni zensimu yamagnetic yoMhlaba, kungaholela ekuqothulweni. Ngakho-ke kubonakala sengathi ukuqothulwa kwama-dinosaur kungase kuhlotshaniswe nezinguquko ensimini yamagnetic yoMhlaba. V. uthe ubuthi be-angiosperm. Ukuphela kwenkathi yama-dinosaur, ama-gymnosperm oMhlaba ayanyamalala kancane kancane, athathelwe indawo yinani elikhulu lama-angiosperm, ama-gymnosperm aqukethe lezi zitshalo azikho esimweni esinobuthi sokudla okungajwayelekile kwe-dinosaur enkulu, ukudla inani elikhulu lama-angiosperm kwaholela ekuqongeleleni ubuthi emzimbeni. Kuningi kakhulu, ekugcineni ubuthi. Isithupha, kusho imvula ye-acid. Isikhathi saseCretaceous sasekupheleni kungenzeka ukuthi sasingaphansi kwemvula enamandla ye-acid, inhlabathi, kufaka phakathi i-strontium ku-trace element, ama-dinosaur ancibilikisiwe ngokusebenzisa amanzi okuphuza nokudla, ngokuqondile noma ngokungaqondile, ukudla kwe-strontium, ubuthi obuyingozi noma obuhlala isikhathi eside, amaqembu okugcina abafileyo.
Izizathu zokuphela kwama-dinosaur zisekelwe emcabangweni wokuthi okukhulunywe ngawo ngenhla kukhulu kakhulu kunalawa. Kodwa le mbono eshiwo ngenhla emphakathini wesayensi inabasekeli abaningi. Yiqiniso, ngayinye yalezi ezingenhla, kukhona indawo engaphelele. Isibonelo, "ukushintsha kwesimo sezulu" akucacisi izimbangela zokushintsha kwesimo sezulu. Ngemva kokuhlola, amanye ama-dinosaur amancane e-Coelurosauria, anezinsalela ezanele zokulwa nezilwane ezincelisayo ezincane, ngakho-ke "izinhlobo ziyalwa ukusho ukuthi" kunezihibe. Ku-geology yesimanje, "inkolelo-mbono yokukhukhuleka kwezwekazi" ngokwayo isengumbono. "Ubuthi be-Angiosperms" kanye "nemvula ye-acid" kusho ukuntuleka okufanayo kobufakazi obanele. Ngenxa yalokho, imbangela yangempela yokuphela kwama-dinosaur, abakayihlolisisi kabanzi.
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