Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Pakazosvika nguva yeAmerican Civil War, sezvo kufamba kweteregirafu kwakawedzera, muitiro wesero reGrove wokubudisa utsi hune chepfu nitrogen dioxide (NO2) wakaratidza kuva une ngozi zvikuru kuutano, uye sezvo teregirafu yakava yakaoma zvikuru, kudikanwa kwamagetsi anogara aripo kwakava kunokosha. Sero reGrove rakanga risingakwanisi kuita izvi, nokuti sero racho parinenge richibudiswa magetsi, simba rinenge richiwedzera rinenge richiderera. Pakupedzisira, masero aGrove akatsiviwa nemasero aDaniell.  Mubvunzo: Ipurogiramu ipi yemagetsi yakatsiva purogiramu yepakutanga yemagetsi?
Daniell masero