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

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

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World Geography
Which among the following principle is used by Bats?

SONAR (Sound Navigation & Ranging
law of reflection
law of diffraction
RADAR (Radio Detective & Ranging

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