Shield volcanoes pom worldwide Lawv tuaj yeem tsim cov hotspots (cov ntsiab lus uas magma los ntawm hauv qab ntawm qhov chaw zoo), xws li Hawaii-Emperor seamount chain thiab Galápagos Islands, los yog dhau ntau qhov chaw sib cais, xws li Icelandic cov ntaub thaiv npog thiab cov ntaub thaiv hluav taws kub ntawm East Africa.
daim thaiv hluav taws kub nyob qhov twg?
Shield volcanoes tau pom ntawm thaj tsam sib txawv, qhov twg ob daim phiaj txav deb ntawm ib leeg. Shield volcanoes muaj cov yam ntxwv hauv qab no: Bas altic magma, uas yog qhov kub thiab txias, tsis tshua muaj silica thiab muaj roj tsawg.
Qhov twg feem ntau cov ntaub thaiv npog hluav taws xob ua cov lus nug?
Shield volcanoes feem ntau tshwm sim ntawm divergent ciam teb. Tshwj xeeb, lawv tuaj yeem tshwm sim hauv rift kwj ha thiab nruab nrab dej hiav txwv ridges, uas txhua tus tsim ntawm cov ciam teb sib txawv lawv tus kheej. Lawv kuj tsim ntawm hotspots.
daim thaiv hluav taws xob tsim li cas?
Shield volcanoes yog tsim los ntawm lava ntws ntawm qis viscosity - lava uas ntws yooj yimYog li ntawd, lub roob hluav taws kub uas muaj qhov dav dav yog tsim los ntawm lub sijhawm los ntawm kev ntws tom qab ntws los ntawm qhov sib txawv. Cov kua dej bas altic lava tawm ntawm qhov cua lossis qhov tawg ntawm lub roob hluav taws.
Puas Shield volcanoes tsim nyob rau hauv dej hiav txwv?
Shield volcanoes feem ntau form saum qhov chaw kub hauv dej hiav txwv. Lub magma uas pub cov volcanoes no yog los ntawm sab sauv mantle. Composite volcanoes (stratovolcanoes) tsim nyob rau hauv subduction zones qhov twg cov dej hiav txwv daim hlau subducts hauv qab ib tug continental phaj.
