World Geography
The major geological events of the Palaeozoic era include

both (a) and (b)
None of these
Appalachians and Central European mountains come up
Caledonian mountain rise, life comes ashore

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World Geography
The modern theory of plate tectonics states

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

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