Mary Allen
Nguva yechando inguva yakareba apo pasi rose rinotonhora zvikuru kupfuura nguva dzose. Mamwe masayendisiti anotaura nezvenguva yeaizi apo danda rimwe chete renyika rinenge rakazara nechando. Zvadaro pane nguva dzose ice. Mamwe masayendisiti anoona kuti matanda ose ari maviri epasi anofanira kunge akagadzirwa nechando. Nekuti nhasi Arctic neAntarctic zviri pasi peaizi, tiri kurarama munguva yechando.
Planet Earth ine makore anoda kusvika mabhiriyoni mana nehafu. Bhiriyoni rinoumbwa ne1000 mamiriyoni. Muiyi nhau refu yapasi, kwave kune kanenge makore mashanu echando. Muzera rakadaro rechando rinowanzotonhora. Asi panewo dzimwe nguva apo kunenge kuchinyanya kudziya. Nguva yekutonhora muzera rechando inonzi glacial, uye nguva yekudziya inopindirana. Saka nguva yechando iri pakati penguva dzechando.
Nhasi tiri kurarama munguva ye geological inonzi Quaternary. Iyi quaternary yakatanga mamiriyoni maviri nehafu makore apfuura. Iyo Quaternary inguva yechando. Zvisinei, ine nguva yekutonhora uye nguva yekudziya. Nyika yanga iri muHolocene kwemakore anoda kusvika 11,700. Iyi inguva yekudziya. Saka tinorarama munguva inodziya munguva yechando.
Nyika inenge yakaita sei munguva yechando?
Kana munhu achitaura nezve "Ice Age" nhasi, munhu angangove ari kufunga nezvenguva isati yasvika nguva yedu yechando: "nguva yekupedzisira yekutonhora". Kunyange zvakadaro, somuenzaniso, North Pole yakafukidzwa nechando, sezvazviri nhasi. Asi aizi yakaenda kumaodzanyemba. Hafu yeGermany yakanga iri pasi peaizi panguva iyoyo.
Yakawanda yeaizi yakagadzirwa nemvura yaibva mumakungwa. Somugumisiro, mvura shoma yakasiiwa kumakungwa: mwero wegungwa wakanga wakaderera kupfuura zvauri nhasi. Iyoyo yaive 110 metres muEurope.
Kana gungwa radzika, dzimwe nzvimbo dzanyura zvino dzinoramba dziri panyika. Muenzaniso ndeweNorth Sea: Mativi makuru egungwa iri aingova pasi panguva yeIce Age. Paigara vanhu veStone Age. Zvitsuwa zveBritish zvaisava zvitsuwa zvachose, asi chikamu chenyika.
Kwaitonhora zvikuru muEurope neNorth America. Vanhu vaifanira kupfeka zvinodziya kana kuti kugara kumaodzanyemba. Asi panguva iyoyo kwaiva nemhuka dzakawanda dzinoyamwisa, dzakadai semammoths nemombe huru. Waigona kuavhima. MuHolocene, nguva yedu yechando, mhuka dzakawanda dzinoyamwisa dzakatsakatika. Vatsvakurudzi nhasi havana chokwadi kana izvi zvakakonzerwa nechisikigo kana kuti vanhu ndivo vaikonzera.