World Geography
The place where material is excavated when the zone of maximum stream velocity approaches the stream's bed is called

scoured pools
riffles
flood plain
ox-bow lakes

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World Geography
The modern theory of plate tectonics states

All of these
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid
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

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