Chalk, mos, nplua-grained, yooj yim pulverized, dawb-rau-grey ntau yam ntawm limestone. Chalk yog tsim los ntawm cov plhaub ntawm cov kab mob hauv nruab nrog cev xws li foraminifera, coccoliths, thiab rhabdoliths. Cov hom ntshiab tshaj plaws muaj txog li 99 feem pua calcium carbonate nyob rau hauv daim ntawv ntawm cov ntxhia calcite.
chalk chalk yog dab tsi?
Blackboard thiab sidewalk chalk yog tsim los ntawm cov pob zeb sedimentary ntawm tib lub npe; ib daim ntawv ntawm mos limestone. Chalk, tsim los ntawm calcium carbonate (CaCO3), tsim hauv qab dej los ntawm qeeb qeeb thiab compression ntawm calcite shells ntawm ib leeg-celled coccolithophores.
Koj ua chalk li cas?
3 Txoj Kev 3 ntawm 3: Pob Kws
- Sau cov khoom siv. Daim ntawv qhia chalk yooj yim hu rau ob lub ntsiab lus tseem ceeb: pob kws thiab dej, hauv qhov sib npaug. …
- Npaj cov pwm. …
- Sib tov pob kws thiab dej. …
- Ntxiv xim zaub mov. …
- Muab cov av sib tov sib xyaw rau hauv pwm. …
- Cia daim av qhuav qhuav. …
- Tiav.
Kuv siv tau dab tsi yog kuv tsis muaj chalk?
Yog li lawv muaj lawv daim ntawv teev npe, thiab kuv muaj kuv lub luag haujlwm: Nrhiav lwm txoj hauv kev ib txwm siv chalk uas kuv cov ntxhais siv tau rau lub caij ntuj sov no.
Yam koj xav tau:
- 1 khob dej.
- 1 khob hmoov.
- ib nyem ntawm xab npum.
- 6-7 tee ntawm cov xim uas ntxuav tau lossis xim zaub mov kom muab cov xim xim.
- Tshuaj ntsuab.
Vim li cas noj chalk phem rau koj?
Kev noj cov av nplaum feem ntau tuaj yeem cuam tshuam koj lub plab zom mov thiab ua rau koj lub cev puas tsuaj. Cov teeb meem ntawm kev noj cov chalk tsis tu ncua muaj xws li: cov hniav puas lossis kab noj hniav. digestive nyuaj.
