(i) Yuav luag txhua yam peb siv los ntawm tus pin me me mus rau lub tsev siab lossis lub nkoj loj tag nrho yog tsim los ntawm cov ntxhia pob zeb. (ii) Cov kab tsheb ciav hlau thiab tarmac (paving) ntawm txoj kev yog tsim los ntawm cov ntxhia. (iii) Tsheb, tsheb npav, tsheb ciav hlau, dav hlau yog tsim los ntawm cov pob zeb hauv av thiab khiav ntawm cov khoom siv hluav taws xob los ntawm lub ntiaj teb.
Yuav ua li cas cov ntxhia yog indispensable?
Teb tiav: Mica yog suav tias yog ib qho tseem ceeb tshaj plaws thiab siv hauv kev lag luam hluav taws xob thiab hluav taws xob. Mica yog malleable thiab cov nplooj ntawv no yog hydrophilic, saj zawg zog, lub teeb, resilient, reflective, thiab refractive.
Vim li cas cov zaub mov tseem ceeb ntawm peb lub neej 8?
Kev piav qhia: Minerals yog ib feem tseem ceeb ntawm peb lub neej vim nws yuav tsum tau tsim txhua yam xws li tshuab, khoom siv, tsev thiab lwm yam.
Dab tsi yog ob pawg minerals?
Cov zaub mov tseem ceeb qee zaum tau muab faib ua cov zaub mov tseem ceeb (macrominerals) thiab cov kab noj hniav (microminerals). Ob pawg ntawm cov zaub mov no tseem ceeb sib npaug, tab sis cov pob zeb hauv av xav tau tsawg dua li cov zaub mov loj.
Yuav ua li cas cov zaub mov yog ib feem tseem ceeb ntawm peb lub neej piav qhia tsib piv txwv?
1- tus pin me me rau lub tsev siab lossis lub nkoj loj yog txhua yam ua los ntawm cov ntxhia pob zeb. 2- cov kab railway thiab Tarmac ntawm txoj kev yog tsim los ntawm cov ntxhia. 3- tsheb,tsheb npav, dav hlau thiab lwm yam yog tsim los ntawm cov zaub mov thiab khiav ntawm cov khoom siv hluav taws xob tau los ntawm lub ntiaj teb. 4- tag nrho cov khoom siv ntawm cov tshuab yog tsim los ntawm cov ntxhia.
