1, Cov yam ntxwv ntawm Diatomite Diatomite feem ntau siv ua lus Askiv li "diatomite, diatomaceous earth, kieselguhr, inforial ntiaj teb, Tripoli, fossil hlau" thiab lwm yam.Diatomite yog tsim los ntawm deposition ntawm cov seem ntawm ancient unicellular dej cog diatoms.Lub unique proper...
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