World Geography
The major geological events of the Palaeozoic era include

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

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World Geography
The temperature inversion is

whenever the normal decrease of atmospheric temperature or moisture or both change with height over
whenever the normal decrease of atmospheric temperature
when the decrease in temperature or moisture or both takes place
All of these

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