World Geography
The phenomenon of an opening occurring in the earth's surface through which a jet of hot water and steam is forces out at irregular intervals is called

crater
hot spring
geyser
volcano

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World Geography
The modern theory of plate tectonics states

the creation of oceanic crust and the drifting of continents
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light
All of these
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid

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