Final answer:
Both temperature and pressure decrease with increasing altitude in all layers of the atmosphere, with pressure decreasing due to the lesser weight of air and temperature decreases following the atmospheric lapse rate or due to less direct UV radiation absorption at higher layers.
Step-by-step explanation:
In all layers of the atmosphere, both temperature and pressure decrease with increasing altitude.
Atmospheric pressure, which is the pressure exerted by the weight of air in the Earth's atmosphere, decreases as the altitude increases because there is less air above a given point to exert pressure.
Similarly, although temperature can fluctuate depending on the atmospheric layer, the general trend in the troposphere (the lowest layer of the atmosphere) is that temperature decreases with altitude, following a lapse rate of about 6.5 K per km.
Higher up in the stratosphere, temperature can increase with altitude due to absorption of UV radiation by ozone, but eventually, in layers like the mesosphere and thermosphere, it decreases again.
Thus, while specific temperature trends may vary by layer, generally, both pressure and temperature will decrease with increased altitude.