World Geography
The part of the earth and thin layer of air above its surface, which support life on earth, are referred to as

biosphere
mesosphere
ionosphere
stratosphere

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World Geography
Which among the following pairs is/are correctly matched?Horst – Depressed block of planetary crust bordered by parallel faultsOceanic trench  – Depressed block of planetary crust bordered by parallel faultsSelect the correct code from the options given below:

Neither 1 & 2
Only 1
Both 1 & 2
Only 2

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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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