Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Nickel chinhu chemakemikari chine chiratidzo Ni uye nhamba yeatomu 28. Isimbi inopenya yakachena sesirivha ine ruvara rwegoridhe. Nickel ndeyemitengo inochinja uye yakaoma uye inochinjika. Nickel yakachena, yakasvibiswa kuti iwedzere nzvimbo inoshanda, inoratidza chiitiko chakakosha chemakemikari, asi zvidimbu zvakakura zvinononoka kuita nemhepo pasi pemamiriro akajairwa nekuti oxide layer inoumba pamusoro uye inodzivirira kumwe kuora (passivation). Kunyange zvakadaro, nickel yakachena inowanikwa muCust Earth chete muzvikamu zviduku, kazhinji mumatombo eultra-mafic, uye mukati me nickel-iron meteorites yakakura iyo isina kuratidzwa kune oksijeni apo iri kunze kwenyika yepasi.  Mubvunzo: Ruvara rwei?
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