Cov iav fwj ua li cas?
Khob, ntawm chav kawm.
Tab sis txhua yam iav tsis zoo li qub, ib yam li tsis tag nrho cov yas yog tib yam.
Cov thawv ntim feem ntau yog dej qab ntsev iav. Cov kua dej qab zib yog feem ntau yog silica dioxide (~ 74%), sodium oxide (~ 13%), thiab calcium oxide (~ 10-11%).
Lwm yam 2-3% muaj ntau hom tshuaj xws li alumima-oxide, magnesium oxide, potassium oxide, iron oxide, titanium dioxide, sulfur trioxide, thiab lwm yam chemicals.
Cov tshuaj sib tov ntau yam muaj ntau yam tshuaj. Piv txwv li, me me kub hauv cov dej yuav ua rau lub khob ntshav.
Cov lus teb uas tshwm sim hais tias cov iav feem ntau yog xuab zeb, tab sis nws tseem ceeb heev kom paub tias cov xuab zeb yog ua li cas. Cov xuab zeb ntau yog feem ntau silica dioxide, los yog quartz, tab sis ntug hiav txwv muaj ntau yam khoom. Ib co xuab zeb, zoo li uas pom nyob rau ntau qhov chaw dawb hauv cov xuab zeb, feem ntau tau tawg hauv lub corals thiab qwj ntses. Qhov xuab zeb yog feem ntau aragonite, kuj hu ua calcium carbonate.
