Final answer:
The tropopause is typically found at an altitude of 12-15 km above Earth's surface on a skew T plot, but varies with geographical location.
Step-by-step explanation:
The tropopause is the boundary layer between the troposphere and the stratosphere. On a skew T plot, which is a common diagram in meteorology used to display upper air observations, the pressure height at which the tropopause is found varies depending on geographical location and atmospheric conditions. Typically, the tropopause is situated at an altitude of 12-15 km above Earth's surface; however, it is higher in the tropics and lower at the poles. This variation is due to temperature changes within the atmospheric layers, where the air temperature stops decreasing with height and may even start to increase at the tropopause.