Duniyar mu ta juya baya shekaru miliyan 84 da suka wuce lokacin da dinosaur suka yi tafiya a duniya. Hakazalika, wani abin al'ajabi da ake kira canjin sandar sanda na gaske yana faruwa, mai iya canza karkata zuwa ga sararin samaniya dangane da kusurwoyinsa da kuma haifar da "ragi". Akwai wasu bincike da suka tabbatar da haka ƙasa za ta iya ƙwanƙwasa a kan gaɓarta kuma wannan na iya haifar da babbar matsala ga bil'adama da rayuwa kamar yadda muka sani.
Don haka, za mu sadaukar da wannan labarin don ba ku labarin yadda duniya za ta iya kunna kullinta da irin sakamakon da za ta iya haifar.
Duniya na iya tinkarar axis
Juyin sanda na gaskiya yana faruwa ne lokacin da sandunan arewa da kudu na duniya ke motsawa sosai, yana haifar da daskararren ɓawon burodi zuwa cikin rigar ruwa na sama wanda ke kare ainihin. Filin maganadisu ko rayuwa a Duniya ba a shafa ba. amma dutsen da aka yi gudun hijira ya rubuta tashin hankali a cikin nau'in bayanan paleomagnetic.
"Ka yi tunanin kana kallon Duniya daga sararin samaniya," in ji Joe Kirschvink, masanin ilimin kasa a Cibiyar Fasaha ta Tokyo a Japan, kuma daya daga cikin marubuta. "Gaskiya polar drift drift yana ba da ra'ayi cewa duniya tana karkata zuwa gefe ɗaya, lokacin da ainihin abin da ke faruwa shi ne cewa saman dutsen (mantle da ɓawon burodi) yana jujjuya sama da rigar ruwa da kuma kewayen ainihin ainihin."
“Duwatsu da yawa sun yi rikodin yanayin filin maganadisu na gida yayin da suke tasowa, kamar yadda kaset ke rikodin kiɗan,” Cibiyar ta bayyana a cikin wata sanarwa. Alal misali, ƙananan lu'ulu'u na magnetite da ke samuwa magnetosomes suna taimaka wa ƙwayoyin cuta daban-daban su daidaita kansu kuma suna daidaita daidai da sandunan maganadisu. Yayin da duwatsun suka ƙarfafa, sai suka zama tarko kuma suka kafa "masu alluran kamfas na microscopic," suna nuna inda sandar ta kasance da kuma yadda yake tafiya a lokacin marigayi Cretaceous.
Har ila yau, wannan rikodin na filin maganadisu yana ba mu damar sanin nisa daga dutsen daga gefen: a arewacin kogin, idan yana da kyau a tsaye, yana nufin yana kan sandar, yayin da idan yana kwance, wannan yana sanya shi a cikin equator. Canje-canje a yanayin yanayin shimfidar da ke daidai da wannan zamani zai nuna cewa duniya tana "tafiya" a kan gadi.
Nazari kan ko Duniya za ta iya tinkaho da kuturinta
Don gano alamun wannan al'amari, wani marubuci, Farfesa Ross Mitchell na Cibiyar Nazarin Geology da Geophysics da ke birnin Beijing, na kasar Sin, ya tuna da wani kyakkyawan wuri da ya yi nazari a lokacin yana dalibi. Wannan ita ce Lake Apiro, a cikin tsaunukan Apennine, a tsakiyar Italiya, inda aka kafa farar ƙasa a daidai lokacin da suke sha'awar bincike: tsakanin shekaru miliyan 1 zuwa 65,5 da suka wuce, kusan ranar da za a kawar da dinosaur.
Ta hanyar hasashe na yawo na gaskiya, bayanan da aka tattara akan dutsen Italiyanci sun nuna cewa Duniya ta karkata kusan digiri 12 kafin ta gyara kanta. Bayan karkata, ko kuma "kifewa", duniyarmu ta canza hanya kuma a ƙarshe ta zana baka na kusan 25°, wanda marubutan suka ayyana a matsayin "cikakken diyya" da "cosmic yo-yo" wanda ya kai kimanin shekaru miliyan 5.
Binciken da ya gabata ya musanta yiwuwar yawo na gaskiya na gaskiya a ƙarshen lokacin Cretaceous, yin fare akan kwanciyar hankali na axis a cikin shekaru miliyan 100 na ƙarshe. "ba tare da tattara isassun bayanai daga bayanan ƙasa ba," in ji marubutan takardar. "Wannan shine daya daga cikin dalilan wannan binciken da kuma tarin kyawawan bayanai na paleomagnetic yana da ban sha'awa sosai," masanin ilmin lissafi Richard Gordon na Jami'ar Rice a Houston ya kara da cewa a cikin sharhin.
Bayanin kimiyya
Duniya shimfida ce mai shimfidar wuri mai kayyadaddun karfe na ciki, wani ruwa na karfen waje, da kuma rigar riga da ɓawon gashi wanda ke mamaye saman da muke rayuwa a kai. Duk suna jujjuya kamar saman, sau ɗaya a rana. Domin Babban duniyar waje ruwa ne, ƙaƙƙarfan alkyabba da ɓawon burodi na iya zamewa a kai. Ingantattun sifofi masu yawa, kamar karkatar da faranti na teku da manyan tsaunuka kamar na Hawaii, sun gwammace su kasance kusa da equator.
Duk da wannan ƙaƙƙarfan ƙaura, filin maganadisu na Duniya yana haifar da igiyoyin ruwa a cikin ƙarfen ruwa mai ɗaukar nauyi Ni-Fe a cikin tsakiyar tsakiya. A kan ma'auni na lokaci mai tsawo, motsin rigar da ke sama da ɓawon burodi ba ya shafar ainihin duniya, saboda waɗannan ma'auni na dutsen suna bayyana a fili zuwa filin maganadisu na duniya. Madadin haka, ana tilastawa tsarin convection a cikin wannan waje na tsakiya su yi rawa a kusa da axis na duniya, ma'ana cewa Gabaɗaya tsarin filin maganadisu na duniya yana iya yiwuwa, yana bajewa kamar yadda faifan ƙarfe ke yin layi akan ƙananan sandunan maganadisu.
Don haka bayanan suna ba da kyakkyawan bayani game da yanayin yanayin sandunan arewa da kudu, kuma karkatarwar tana ba da nisa daga sandunan (filin a tsaye yana nufin kun kasance a sanduna, filin kwance yana nufin kun kasance a madaidaicin). Duwatsu da yawa suna rikodin jagorar filayen maganadisu na gida yayin da suke samarwa, kamar rikodin kiɗan tef. Misali, ƙananan lu'ulu'u na magnetite na ma'adinai da wasu ƙwayoyin cuta ke samarwa a zahiri suna layi kamar ƙananan alluran kamfas kuma sun zama tarko a cikin laka yayin da dutsen ya taru. Ana iya amfani da wannan “kasusuwa” maganadisu don bin diddigin inda axis na juyawa ya motsa dangane da ɓawon duniya.
"Ka yi tunanin kallon Duniya daga sararin samaniya," in ji marubucin binciken Joe Kirschwenk na Cibiyar Fasaha ta Tokyo, inda ELSI ta kasance. "Gaskiya polar drift ɗin yana kama da ƙasa tana karkata gefe ɗaya, lokacin da ainihin abin da ke faruwa shine gaba ɗaya harsashi na duniya (mantle da ɓawon burodi) yana juyawa a kusa da ainihin ruwa." Tashin ruwa na gaskiya ya faru, amma Masana ilimin kasa na ci gaba da muhawara kan ko manyan jujjuyawar riga da ɓawon ƙasa sun faru a baya.
Ina fatan cewa tare da wannan bayanin zaku iya ƙarin koyo game da ko Duniya zata iya kunna axis.