Reference: 1592 Title: Layers of the Atmosphere – NOAA Summary: The troposphere's height varies with latitude, reaching 18–20 km at the equator, 9 km at mid-latitudes, and 6 km at the poles due to temperature differences. URL: https://lweb.cfa.harvard.edu/~kchance/EPS238-2014/class_notes/01-EPS-238-2014.pdf