World Geography
The phenomenon of an opening occurring in the earth's surface through which a jet of hot water and steam is forces out at irregular intervals is called

crater
hot spring
volcano
geyser

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World Geography
Which among the following region has the highest density of rail network?

South east Asia
Western Europe
North America
Eastern Asia

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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

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

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