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

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

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

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