World Geography
The process that creates the deep oceanic trenches is called

continental drift
plate tectonics
isostasy
sea floor spreading

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

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

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World Geography
The Harmattan is

wind that blows during the dry season from December to February
tertiary wind that carry great quantities of fine dust from the Sahara
cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the Af
All of these

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World Geography
Which among the following statements is/are correct about Dust particles in the Earth’s atmosphere?Higher concentration of dust particles is found in equatorial and polar regionsThey are generally found in the lower layers of the atmosphereSelect the correct code from the options given below:

Only 2
Neither 1 & 2
Only 1
Both 1 & 2

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