World Geography
Which among the following statements is/are correct about the Thermosphere?It lies upto an altitude of 80 km from the earth’s surface.It contains electrically charged particles known as ions.The temperature here starts increasing with heights.The International Space Station and other satellites orbit in this layer.Select the correct code from the options given below:

Only 1, 3 & 4
Only 2, 3 & 4
Only 3 & 4
1, 2, 3 & 4

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World Geography
What are secondary mineral deposits formed in caves called?

Speleogenesis
Ejecta Blanket
Pyroclastic debris
Speleothems

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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
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light
the creation of oceanic crust and the drifting of continents

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