Question

Does whater boil at a temperature below 100°c at higher altitudes

Answer 1

Yes — due to the increased pressure.
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Note the equation:
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PV = nRT ;

When the "pressure" , or "P" increases (as it does at higher latitudes), the "temperature", or "T" will increase. So, at higher values of "P", the higher the "T" will be. So increased "P" would result in water boiling, even at values of "T" lower than 100°C .