Video: Yuav ua li cas chalk tsim?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ua li cas Chalk tsim ? Chalk pob zeb (calciumcarbonate), ntshiab daim ntawv ntawm limestone tsim Nyob rau hauv sov, tropical seas li 100 lab xyoo dhau los nyob rau hauv lub Cretaceous lub sij hawm thaum Dinosaurs kav lub ntiaj teb! Tshaj tsheej lab ntawm xyoo txheej txheej chalk sediment yog deposits ua rau compaction ntawm loosesediment rau hauv cov khoom chalk pob zeb.
Tsis tas li ntawd, chalk tau ua li cas?
Blackboard thiab sidewalk chalk yog Ameslikas ua los ntawm cov pob zeb sedimentary ntawm tib lub npe; ib daim ntawv ntawm soft limestone. Chalk yog tsim los ntawm calcium carbonate (CaCO3), tsim underwater los ntawm qeeb tsub zuj zuj thiab compression ntawm calcite plhaub ntawm ib leeg-celledcoccolithophores.
Tsis tas li ntawd, chalk tsim rau cov me nyuam li cas? Chalk tuav dej, yog li no chalk hillshave dej ntau nyob rau hauv lawv, thiab thaum huab cua qhuav heev, dej los maj mam los ntawm lub chalk . Chalk yog feem ntau tsim los ntawm calcareous (CaCO3) skeletons ntawm suav tsis txheeb me me planktonic algae hu ua coccoliths.
Tsis tas li ntawd, chalk los ntawm qhov twg thiab nws ua li cas?
Chalk los los ntawm limestone. Feem ntau ntawm chalk koj tuaj yeem tau txais hnub no yog ua yuav luag 50 txog 100 lab xyoo dhau los. Nws yog chemically ua ntawm calciumcarbonate. Cov pob zeb ntxeem tau pob zeb ib txwm sib sib zog nqus hauv qab hiav txwv qhov chaw me me calcite daim hlau hu ua coccoliths sib sau ua cov limestone.
Dab tsi yog cov yam ntxwv ntawm chalk?
Lub cev thiab tshuaj muaj zog ntawm chalk . - Theluster of chalk yog dawb, sedimentary pob zeb, nws qhuav thiab khaws tau dej ntau. - Chalk tsis muaj kev ua kom yooj yim, vim hais tias ntawm lub siab certine nws crmbles rau hauv daim. - theductility yog dua, tsis muaj dab tsi, chalk yog nruj heev thiab yuav tsis streak.
Pom zoo:
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