Ana auna lokacin tarihin duniya da sikeli na ilimin ƙasa, wanda ya ƙunshi lokutan ilimin ƙasa da miliyoyin shekaru. Duk alamun da ke cikin tebur suna da sabani sosai kuma ana yarda da su gaba ɗaya a cikin masana kimiyya a matakin duniya. Gaba ɗaya, shekarun duniyar mu sun faro ne kimanin shekaru biliyan 4.5-4.6. Ba a sami ma'adanai da duwatsu irin wannan ba a cikin lithosphere, amma an ƙaddara shekarun Duniya ne ta farkon abubuwan da aka samo a cikin tsarin rana. Waɗannan abubuwa ne da ke ƙunshe da aluminium da alli, waɗanda ake samunsu a cikin Allende, tsohuwar meteorite da aka samo a duniyarmu.
An karɓi teburin ilimin ƙasa a karnin da ya gabata. Yana ba mu damar nazarin tarihin Duniya, amma bayanan da aka samo suna ba mu damar yin tunani da gama gari. Tebur wani nau'ine ne na sanya tarihin rayuwar duniya.
Ka'idodin gina teburin ilimin ƙasa
Babban rukunin lokaci na teburin Duniya sune:
- eon;
- zamani;
- lokaci;
- zamani;
- na shekara.
Tarihin Duniya yana cike da abubuwa daban-daban. An raba rayuwar duniya zuwa lokaci kamar Phanerozoic da Precambrian, a cikin su ne duwatsun da ke kwance a ciki suka bayyana, sannan kuma aka haife ƙananan ƙwayoyin cuta, an samar da iskar gas da kuma jigon duniyar. Manyan kasashen (Vaalbara, Colombia, Rodinia, Mirovia, Pannotia) sun sha bayyana kuma sun watse. Bugu da ari, yanayi, tsarin tsaunuka, nahiyoyi sun samu, halittu daban-daban masu rai sun bayyana kuma sun mutu. Lokaci na bala'i da ƙyalli na duniya ya faru.
Dangane da teburin ilimin kasa, dabbobin farko masu yawa a duniya sun bayyana kimanin shekaru miliyan 635 da suka gabata, dinosaur - miliyan 252, da kuma fauna ta zamani - shekaru miliyan 56. Game da mutane, manyan birai na farko sun bayyana kimanin shekaru miliyan 33.9 da suka gabata, da kuma mutanen zamani - shekaru miliyan 2.58 da suka gabata. Yana tare da bayyanar mutum cewa lokacin anthropogenic ko Quaternary ya fara a duniya, wanda ke ci gaba har zuwa yau.
Wani lokaci muke rayuwa yanzu
Idan muka fasalta yanayin duniya ta fuskar teburin ilimin kasa, to yanzu muna rayuwa:
- Phanerozoic eon;
- a cikin zamanin Cenozoic;
- a cikin zamanin anthropogenic;
- a zamanin Anthropocene.
A halin yanzu, mutane suna daga cikin manyan abubuwan da ke haifar da tsarin halittu na wannan duniya tamu. Jin daɗin Duniya ya dogara da mu. Lalacewar yanayi da kowane irin bala'i na iya haifar da mutuwar ba wai kawai dukkan mutane ba, har ma da wasu kwayoyin halittu masu rai na "shuɗin duniya".
