World Geography
The time interval from when the given star passes directly overhead to when it next passed directly overhead, is defined as

one sidereal day
None of these
one solar day
both the terms are similar, so any of these may be used

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

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