A na-eji gel silica mee ya, nke nwere oghere na-ehulata na nke a na-ebugharị, nke dị mfe ịwụnye ma dị mma maka iji mee ihe na oghere dị iche iche.
Ntugharị mgbochi mkpọda concave-convex nwere ike igbochi akụkọ ịpụ ma daa, mmiri na-efesa na mpe mpe akwa mgbochi, ma nwee ike igbapu mmiri ngwa ngwa wee kpọọ nkụ.
