why is it harder to breathe when climbing up a high mountain?
a the air compresses the lungs
b the air pressure increases
c the air is thinner
d the air has more moisture
The correct answer is C - the air is thinner.
When climbing up a high mountain, the altitude increases, and with it, the air becomes thinner. As a person ascends, the atmospheric pressure decreases, resulting in lower levels of oxygen availability. This decrease in oxygen concentration in the air makes it harder for the lungs to extract sufficient oxygen during each breath. Consequently, individuals may experience shortness of breath, coughing, and an increased heart rate as their body tries to compensate for the decreased oxygen levels.