Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Ka'idar hadarin asteroid, wanda Walter Alvarez da abokan aikinsa suka kawo hankali sosai a shekarar 1980, ya danganta lamarin halaka a ƙarshen zamanin Cretaceous zuwa tasirin bolide kimanin shekaru miliyan 66 da suka gabata. Alvarez et al. sun ba da shawarar cewa karuwar kwatsam a cikin matakan iridium, wanda aka rubuta a duk faɗin duniya a cikin dutsen dutsen lokacin, ya kasance shaida kai tsaye game da tasirin. Mafi yawan shaidun yanzu sun nuna cewa wani bolide mai nisan kilomita 5 zuwa 15 (3.1 zuwa 9.3 mil) ya buge a kusa da Yucatán Peninsula (a kudu maso gabashin Mexico), yana haifar da kimanin kilomita 180 (110 mi) Chicxulub Crater kuma yana haifar da mutuwar mutane. Masana kimiyya ba su da tabbacin ko dinosaur suna bunƙasa ko raguwa kafin hadarin ya faru. Wasu masana kimiyya sun ba da shawarar cewa tasirin meteorite ya haifar da raguwa mai tsawo da ba na halitta ba a cikin yanayin yanayin duniya, yayin da wasu ke da'awar cewa a maimakon haka zai haifar da zafin rana mai ban mamaki. Amincewa tsakanin masana kimiyya da ke goyan bayan wannan ka'idar ita ce tasirin ya haifar da ƙarewa kai tsaye (ta hanyar zafi daga tasirin meteorite) da kuma a kaikaice (ta hanyar sanyaya duniya da aka kawo lokacin da aka fitar da abu daga ramin tasirin ya nuna hasken zafi daga rana). Kodayake ba za a iya ƙaddamar da saurin ƙarewa daga tarihin burbushin halittu kadai ba, samfuran daban-daban suna ba da shawarar cewa ƙarewa ya kasance da sauri, yana sauka zuwa sa'o'i maimakon shekaru.  Tambaya: Wataƙila ɓarkewar dinosaur ya faru ne saboda wani abin da ya faru inda?
Yankin Yucatan