Tuff yog ib hom pob zeb ua los ntawm volcanic tshauv ejected los ntawm lub qhov cua thaum lub volcanic eruption. Tom qab ejection thiab deposition, cov tshauv yog lithified rau hauv ib lub pob zeb. Pob zeb uas muaj ntau dua 75% tshauv yog suav tias yog tuf, thaum pob zeb muaj 25% mus rau 75% tshauv tau piav qhia tias yog tuffaceous.
lo lus tufa tuaj qhov twg?
Late 18th century los ntawm Italian, variant of tufo (saib tuff).
lub ntsiab lus yog dab tsi?
tuff in American English
(tʌf) noun. pob zeb ntxeem tau igneous, feem ntau yog stratified, tsim los ntawm kev sib sau ntawm volcanic tshauv, hmoov av, thiab lwm yam.
Puas yog tufa yog pob zeb volcanic?
Tufa yog ntau yam ntawm limestone tsim thaum carbonate minerals precipitate tawm ntawm ambient kub dej. … Tufa, uas yog calcareous, yuav tsum tsis txhob totaub nrog tuff, ib tug ntxeem tau volcanic pob zeb nrog ib tug zoo xws li cov etymology uas yog tej zaum kuj hu ua "tufa".
Puas muaj obsidian?
obsidian, igneous pob zeb tshwm sim raws li ib tug natural iav tsim los ntawm ceev ceev txias ntawm viscous lava los ntawm volcanoes. Obsidian yog nplua nuj nyob rau hauv silica (kwv yees li 65 mus rau 80 feem pua), muaj dej tsawg, thiab muaj cov tshuaj muaj pes tsawg leeg zoo ib yam li rhyolite. Obsidian muaj lub ntsej muag ci ntsa iab thiab nyuaj me ntsis dua li lub qhov rais iav.
