Nthaŵi zonse, mapiri amapangitsa anthu kukhala ndi mantha enieni, koma pali madera onse kumene anthu ammudzi amakakamizika kukhala ndi mbali zazikuluzikuluzi. Kuchokera m'nkhani ino mudzaphunzira mapiri omwe ali aakulu kwambiri ku America.
North America
Mu gawo ili la kontinenti ndi mapiri, omwe ndi aakulu kwambiri pa dziko lapansi , osati ku North America chabe. Zili pafupi ndi phiri la Yellowstone - dzuŵa lalikulu, lomwe lili m'chigawo cha Wyoming, ku National Park. Kutalika kwake ndi mamita 2805. Amaphatikizapo malo okwana makilomita 3,960, omwe ali gawo limodzi mwa magawo atatu a National Park. Malowa ali pamwamba pa malo otenthedwa, kumene kayendetsedwe ka thanthwe lopangidwa ndi nsalu yotchinga likuloza pamwamba pa dziko lapansi. Lero mfundoyi ikuphimbidwa ndi mapiri a Yellowstone, koma zaka zambiri zapitazo ndizo zomwe zinayambitsa mapiri a zigwa zakum'mawa pambuyo pa ziphuphu zambiri za phirili.
Asayansi apeza zotsalira za chigwa cha chiphalaphala chokongola kwambiri mu 1960, motsogoleredwa ndi deta kuchokera ku zithunzi za satana. Zinaoneka kuti malo osungirako magetsi akukhalabe ndi bulula wamkulu wa magma m'matumbo ake. Kutentha kwake kumasiyanasiyana mkati madigiri 800. Ndicho chifukwa chake kuchokera kumtunda kwa dziko kupita ku mpweya wa madzi wambiri, ndipo akasupe amatha kutenthedwa, kutulutsa mpweya woipa ndi mitambo ya hydrogen sulfide.
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Malinga ndi asayansi, kuphulika kwakukulu kwa malo a Yellowstone kunachitika zaka zoposa 2 miliyoni zapitazo. Izi zinayambitsa kusokonezeka kwa mapiri, kuphatikiza 25 peresenti ya gawo la North America yamakono ndi phulusa la phulusa la mapiri. Kuphulika kwachiwiri kunafika zaka 1.27 miliyoni zisanafike nthawi yathu, ndipo chachitatu chinachitika zaka 640,000 zapitazo. Kenaka lalikulu lalikulu lomwe linali ndi makilomita 150 linakhazikitsidwa, lomwe limatchedwa caldera. Izi zinachitika chifukwa cha kulephera kwa vertex ya chiphalaphala chachikulu. Malinga ndi asayansi, mwinamwake kuti mapiri amphamvu angakhoze kuwuka ndi 0.00014%. Mwina ndizosavomerezeka, koma zilipo.
South America
Ku South America, phiri lalikulu lomwe likuphulika ndi phiri la Cotopaxi, lomwe kutalika kwake ndi 5896 mamita. Malo achiwiri ndi a mapiri a Sangay (5,410 mamita), ndipo lachitatu ku Popocatepetel wa Mexican (mamita 5452). Buku lotchedwa Guinness Book of Records limanena kuti phiri lophulika kwambiri ndi Ochos del Salado, lomwe lili pamalire a Argentina ndi Chile, koma akuonedwa kuti satha. Zonsezi, ku South America kuli mapiri akuluakulu ndi ang'onoang'ono okwana 194, ambiri omwe amatha kutha.
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