Cov rooj hluav taws xob sab hauv sab hauv tsis yog rau cov lag luam hauv qhov chaw uas lawv raug cai nyob sab hauv cov rooj sab hauv tuaj yeem muab rau kev siv hluav taws xob sab hauv tsev ib yam nkaus. Hluav Taws Kub sab hauv feem ntau muaj kev ntsuas ntawm 20, 45 lossis 60 feeb ntsuas, muaj qee qhov kev ntsuas hluav taws kub uas muaj 90 lossis 180 feeb hauv cov ntawv thov kev lag luam loj.
Rau qhov rooj sab hauv uas muaj cov khoom nyab xeeb hluav taws xob, tab sis tsis yog hluav taws kub, xav txog cov khoom khov kho sab hauv qhov rooj. Cov pob tub ntxhais tsis muaj cov ntoo, tab sis lawv muaj cov hluav taws xob ntxhiv lossis cov khoom ua suab nrov zoo nkauj thiab muaj zog dua li lawv cov khoom siv hollow. Txij li muaj ntau ntxiv rau lub qhov rooj kom hlawv los ntawm ntau lub hollow core me core qhov rooj, lawv muaj kev tiv thaiv hluav taws me me ntxiv.
Ib qho qhia rau kev ua kom muaj kev nyab xeeb tshaj plaws hauv qhov rooj hluav taws xob sab hauv thiab kho vajtse rau cov chaw tsim khoom ntawm lub qhov rooj kom tsim nyog rau cov khoom siv hluav taws xob kom tsim nyog thiab ua kom haum.
