Chalk is a soft, white, porous, sedimentary carbonate rock. Nws yog ib daim ntawv ntawm limestone tsim los ntawm cov ntxhia calcite thiab keeb kwm tsim tob hauv qab hiav txwv los ntawm compression ntawm microscopic plankton uas tau nyob rau hauv hiav txwv pem teb.
chalk yog dab tsi?
Chalk yog tsim los ntawm cov plhaub ntawm cov kab mob hauv qab no xws li foraminifera, coccoliths, thiab rhabdoliths. Cov hom purest muaj txog li 99 feem pua calcium carbonate nyob rau hauv daim ntawv ntawm cov ntxhia calcite. … Cov feem me me ntawm cov av nplaum, glauconite, thiab calcium phosphate kuj muaj.
Puas yog chalk ntuj pob zeb?
Chalk, nyob rau hauv ob qho tib si nws lub ntuj tsim thiab tib neeg tsim, yog xim dawb thiab suav tias yog cov khoom muag muag. Lawm, Nws los ntawm hauv av uas nws pom raws li ib tug ntxeem tau (tuaj yeem tuav dej) sedimentary pob zeb. Nws yog ib daim ntawv ntawm limestone thiab yog tsim los ntawm cov ntxhia calcite.
Puas yog chalk yog pob zeb lossis pob zeb?
Chalk yog ib qho tsis tshua muaj pob zeb sedimentaryuas tsim hauv qab hiav txwv vim qhov sib xyaw ua ke ntawm daim hlau calcite (ib daim ntawv ntxhia ntawm calcium carbonate) thiab av nplaum me me. thiab silt.
Puas yog chalk yog tib neeg tsim pob zeb?
Chalk yog ntau yam ntawm limestonetsim los ntawm calcium carbonate tau los ntawm cov plhaub ntawm cov tsiaj me me hu ua foraminifera thiab los ntawm cov calcareous seem ntawm marine algae hu ua coccoliths. Chalk feem ntau yog dawb los yog lub teeb grey xim. Nws yog qhov ntxeem tau, permeable, mos thiab friable.
