World Geography
The Penumbra is

the outer portion of the moon's shadow
both (a) and (b)
None of these
formed by the tangent that intersects between the sun and the moon

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World Geography
Which among the following pairs of volcanoes is/are correctly matched?Mount St. Helens – United StatesMount Vesuvius – ItalyMount Krakatoa – IndonesiaSelect the correct code from the options given below:

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

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World Geography
The relative abundance of dissolved salts in seawater in descending order is as follows

chlorine, sodium, magnesium, calcium, potassium, sulphate
sodium, chlorine, magnesium, potassium, sulphate, calcium
chlorine, sodium, sulphate, magnesium, calcium, potassium
chlorine, magnesium, calcium, sodium, potassium, sulphate

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