Drop in air pressure takes place when one goes up a mountain.
• Altitude is associated with air pressure, that is, with an elevation in altitude, there is a drop in air pressure.
• That is why when one goes up the mountain, the person feels a drop in air pressure.
• The air pressure is indicated with the help of an instrument called altimeter.
• There are two reasons of the drop in air pressure with altitude, that is, gravity and density.
• The high altitude regions like mountains are generally much colder than the regions closer to the sea due to low air pressure.
Thus, the correct answer is option C.
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