World Geography
The umbra is

None of these
both (a) and (b)
the inner portion of the moon's shadow
formed by tangents to the sun and moon

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World Geography
Which among the following statements is/are correct about Population of the world?In the twentieth century itself the population has increased four times.Human population increased more than ten times in the past 500 hundred years.World population exploded in the eighteenth century after the Industrial Revolution.Select the correct code from the options given below:

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

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