Video: Hom lava ntws nrawm tshaj plaws li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Feem ntau lava yog basaltic, uas yog li kua thiab li dawb- ntws ib lava raws li koj yuav tuaj hla. Piv rau feem ntau hom , nws yog ua los ntawm qis feem pua ntawm silicon thiab oxygen chains. Cov ntsiab lus no tsim "them" ntawm lub lava , yog li nrog tsawg ntawm lawv tam sim no, lub lava tsawg viscous, thiab nws tuaj yeem ntws sai.
Tom qab ntawd, 3 hom lava ntws li cas?
Txoj kev sib faib feem ntau lava ntws rau hauv qhov sib txawv hom yog li no: Pahoehoe lava ntws , Aw lava ntws , Blocky lava ntws , thiab Pillow lava ntws . Qee zaum Turbulent lava ntws kuj ntxiv, tab sis tom kawg tsuas yog kev xav rau tus kws tshawb fawb xwb vim peb yuav tsis pom qhov ntawd hom lava ntws hauv qhov xwm txheej.
Tsis tas li ntawd, dab tsi yog qhov ceev tshaj plaws lava ntws tau sau tseg? Cov ceev tshaj lava ntws puas tau sau tseg tshwm sim thaum Nyiragongo, nyob rau hauv lub koom pheej ywj pheej ntawm Congo, erupted rau 10 Lub ib hlis ntuj 1977. lava , uas tawg los ntawm qhov tawg ntawm lub roob hluav taws lub flank, tau mus txog qhov nrawm txog 60 km / h (40 mph).
Kuj Paub, puas lava ntws nrawm?
Lava ntws speeds sib txawv raws li viscosity thiab nqes hav. Feem ntau, lava ntws maj mam (0.25 mph), nrog rau qhov siab tshaj plaws ntawm 6-30 mph ntawm qhov chaw siab tshaj.
Puas yog basaltic lava tuab lossis nyias?
Pahoehoe lavas feem ntau yog thawj zaug tawg ntawm lub qhov cua. Lawv kuj yog nyias (1-2 m) thiab kua heev nrog tsawg viscosities. Lawv ua ntej downslope nyob rau hauv ib qho kev sib tw "rolling motion." Lub hauv ntej ntawm qhov ntws feem ntau nce mus raws li a nyias (<20 cm) glowing lobe uas yuav txias thiab crust tshaj tom qab 1-2 meters ntawm ntws.
Pom zoo:
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Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom