Video: Dab tsi ua rau tawg tawg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv volcanology, ib tawg tawg yog volcanic tawg ntawm hom phem tshaj plaws. Xws li tawg tshwm sim thaum cov pa txaus tau yaj nyob rau hauv lub siab nyob rau hauv ib tug viscous magma xws li tshem tawm lava hnyav froths mus rau hauv volcanic tshauv thaum lub siab yog dheev txo qis ntawm lub qhov cua.
Tsis tas li ntawd paub yog, ua li cas eruptions tshwm sim?
Kev tawg tawg tshwm sim qhov twg txias dua, ntau magmas (xws li andesite) ncav cuag qhov chaw. Cov pa hluav taws xob tawg tsis tuaj yeem khiav tawm tau yooj yim, yog li lub siab tuaj yeem tsim kom txog thaum cov pa tawg tawg tawg pob zeb thiab lava tawg rau saum huab cua! Cov no tawg tsim kom muaj ntau steeply-sloping Composite roob hluav taws zoo li qhov no hauv Chile.
Tsis tas li ntawd, ntau npaum li cas cov tawg tawg loj tshwm sim? Cov kev tawg loj tshaj plaws los ntawm roob hluav taws hu ua rhyolite calderas, thiab cov no kev tawg loj heev (uas peb tsis tau pom tiag tiag txij li xyoo 186 AD hauv New Zealand) tej zaum tshwm sim ntawm 10,000 txog 30,000 xyoo. Yellowstone, ua loj tshaj plaws caldera hauv Teb Chaws Asmeskas zoo li tawg qhov nruab nrab txhua txhua 600,000 xyoo!
Tsis tas li ntawd, qhov twg tawg volcanic eruptions tshwm sim?
Kev tawg volcanism . Ib feem ntawm Hall of Planet Earth. Feem ntau tawg tawg tshwm sim hauv roob hluav taws saum toj no subduction zones, qhov twg ib lub phaj tectonic dhia hauv qab rau lwm qhov. Yim caum mus rau 120 mais hauv qab ntawm qhov chaw, magma cov ntaub ntawv thaum cov pob zeb ntawm lub mantle yaj saum lub phaj subducting.
Dab tsi yog qhov txawv ntawm qhov extrusive thiab tawg tawg?
Effusive tawg - magma nce los ntawm qhov chaw thiab ntws tawm ntawm lub roob hluav taws raws li cov kua nplaum hu ua lava. Kev tawg tawg - magma yog torn sib nrug thaum nws nce thiab nce mus txog saum npoo ntawm daim ntawv hu ua pyroclasts. Txawm li cas los xij, feem ntau tawg volcanoes xws li Mount St.
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