Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Passage: Sechikamu chebasa iri, akatanga kuisa mumapoka zvicherwa zvichienderana nezvazviri chaizvo, pane kuti aite zvinoenderana nemakemikari azvo, sezvaiitwa kare. Uku kusimbiswa kwezvinhu zvokunyama kwakanga kuchipesana nemitemo yemakemikoro yaivapo. Zvisinei, vose vari vaviri Theophrastus naPliny Mukuru vakanga vaenzanisa kuomarara kwakati kwezvicherwa zvavaiziva munyika yekare, kubatanidza dhaimondi nequartz. Vaiziva kuti dhaimondi raigona kukwenya quartz, nokudaro vachiriratidza kuva rakaoma. Ikoku kwakava hwaro hwechiyero choukukutu chakagadzirwa naMohs. Mineral yakaoma zvikurusa, diamond yakapiwa ukoshi hwe10 uye mineral dzakapfava dzakadai setalk dzakapiwa ukoshi hwakaderera zvikuru hwe1 (chinhu chimwe). Mamwe mamineral akapiwa kukosha kwepakati, zvichienderana nokugona kwawo kukwenya imwe mineral iri pachikero. Nokudaro gypsum yakapiwa ukoshi 2 nemhaka yokuti ichakwenya makristasi etalc, uye calcite ukoshi 3 nemhaka yokuti ichakwenya gypsum. Zvicherwa zvino zvinorongwawo nemakemikoro, asi zvinhu zvomuviri zvichiri kubatsira pakuongorora.  Mubvunzo: Theophrastus naPliny Mukuru vakakamura zvicherwa vachishandisa zvinhu zvipi?
unhu hwomuviri