Nyob rau hauv kev ua cov tshuab xuab zeb thiab gravel, nws yog qhov tseem ceeb tshaj plaws rau cov khoom siv ntawm lub cev, thiab kev saib xyuas cov khoom siv ua tau zoo thiab ua haujlwm, thiab kev saib xyuas ntawm cov khoom siv xuab zeb thiab gravel.}}} muab, nws hais txog lub siab tawv thiab ua rau muaj kev ua pob zeb ua lag luam {}}
Lub pob zeb tsoo ntawm cov pob zeb feem ntau yog tus cwj pwm los ntawm cov pob zeb ua kom tawg (wi) Cov khoom siv crushing, uas nyob rau hauv lem cuam tshuam cov khoom siv. Lub pob zeb feem ntau pom nyob rau hauv hydroche pob zeb muaj xws li tob-lub pob zeb niaj hnub (xws li granite, Senenite, thiab Diorite) thiab cov pob zeb loj heev (xws li basalt thiab dej hiav txwv
Aberration index AI thiab Sio2 cov ntsiab lus yog feem ntau siv los ntsuas cov pob zeb loj, thiab hnav tus nqi ntawm cov khoom siv nyuaj ntawm cov khoom siv-tiv thaiv lub sijhawm thaum lub sijhawm ua haujlwm, yog li pob zeb Kev tshem tawm cov khoom tseem ceeb rau kev txiav txim siab cov cuab yeej kev siv.} .
