World Geography
The greatest variety of animal and plant species is found in

in hot deserts
temperate grasslands
tundra regions
tropical moist forests

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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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World Geography
The periodic rise and fall of the sea level on the earth, gives rise to tides. This is related to

infrared rays from the sun
ultraviolet rays from the sun
the position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
None of these

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