Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Kupfuura: Pasi raiwanzo tonhora munguva yeCambrian yapakuvamba, zvichida nemhaka yekondinendi yekare yeGondwana yaifukidza South Pole uye ichigura nzizi dzegungwa dzomugungwa. Zvisinei, avhareji yetembiricha yaiva 7 degrees Celsius yakakwirira kupfuura nhasi. Pamwe paiva nemapapiro echando ari kumahombekombe epasi uye mamwe makore echando, sezvo nyika yakanga ichiri kupora kubva kuSnowball Earth yapfuura. Yakapisa zvikuru pedyo nomugumo wenhambo yacho; mazaya echando akadzokera shure uye pakupedzisira akanyangarika, uye mwero wegungwa wakakwira zvikuru. Muitiro uyu waizopfuurira kusvikira kunguva yeOrdovician.  Mubvunzo: Inguva ipi yakaona mwero wegungwa uchiramba uchikwira?
Ordovician