Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Minnesota ine mamwe ematombo akare zvikurusa apasi, gneisses ayo ane makore anenge mabhiriyoni 3,6 okukura (80% akwegura sepasi). Makore anenge mabhiriyoni 2,7 akapfuura, guruva rebasalt rakabuda mumakomba aiva pasi pegungwa rekare; zvisaririra zveibwe iri raibva mugomo rinoputika zvakaumba Canadian Shield iri kuchamhembe kwakadziva kumabvazuva kweMinnesota. Midzi yemakomo aya anoputika uye kushanda kwemakungwa ePrecambrian zvakaumba Iron Range yokuchamhembe kweMinnesota. Pashure penguva yokuputika kwemakomo makore mabhiriyoni 1,1 akapfuura, basa renyika yeMinnesota rakanga rakadzikama zvikuru, risina kuputika kwemakomo kana kuumbwa kwemakomo, asi nekupinda kwakadzokororwa kwegungwa, uko kwakasiya shure matombo akawanda edombo. Munguva pfupi yapfuura, mazaya makuru echando ane ukobvu hwemakiromita imwe chete akaparadza nzvimbo yenyika uye akaveza nzvimbo yayo. Nguva yechando yeWisconsin yakaguma makore 12 000 akapfuura. Madziva aya echando akafukidza Minnesota yose kunze kwokumaodzanyemba kwakadziva kumabvazuva, nzvimbo ine makomo ane mawere uye nzizi dzinochera mudombo. Iyi nharaunda inozivikanwa seDriftless Zone nokuda kwokushayikwa kwayo kwokutsvaira kwechando. Ruzhinji rwasara rwenyika kunze kwokuchamhembe kwakadziva kumabvazuva rune mamita 50 kana kupfuura echando chakasiiwa shure sezvo mazaya echando okupedzisira akadzokera shure. Gungwa guru reAgassiz rakaumbwa kuchamhembe kwakadziva kumadokero makore 13 000 akapfuura. Mvura yaro yakaita kuti mupata woRwizi Rutsvuku uve wakaorera, uye rwizi rwawo runoyerera, rwizi rwechando runonzi Warren, rwakaita kuti mupata woRwizi rweMinnesota neUpper Mississippi uve wakafara kubva kuFort Snelling. Minnesota yakanyarara nhasi; kunongoitika kudengenyeka kwepasi kashoma, uye zhinjisa dzacho iduku.  Mubvunzo: Makore mangani adarika Wisconsin yakava nerwizi rwechando?
Makore 12 000 akapfuura