The air pressure gets lower!
Yes, it does, due to the decreasing pressure at higher altitudes.
The density of air decreases at higher altitudes.
because there is low pressure at higher altitudes
The density of air decreases as altitude increases.
Yes.
Most recipes in cookbooks are written for sea level conditions. At higher altitudes some recipes (especially baking) need to be adjusted in one or more ways due to the slightly lower air pressure and resulting lower boiling temperature of water. A good quality modern cookbook should include any required adjustments.
They have cooler temperatures than places at lower altitudes.
altitudes
No, though higher altitudes will be at the freezing point more often.
You get polycythemia
They have cooler temperatures than places at lower altitudes.
PAULY D IS A BEAST ik this is not the answer