A. At the equator any day of the year
B. In polar regions in winter
C. At the top of a high mountain in winter
D. On a desert in winter
E. In a deep valley during the summer
In meteorology, an inversion, also known as a temperature inversion, is a deviation from the normal change of an atmospheric property with altitude. It almost always refers to an inversion of the thermal lapse rate. Normally, air temperature decreases with an increase in altitude. During an inversion, warmer air is held above cooler air; the normal temperature profile with altitude is inverted.
An inversion traps air pollution, such as smog, close to the ground. An inversion can also suppress convection by acting as a “cap”. If this cap is broken for any of several reasons, convection of any moisture present can then erupt into violent thunderstorms. Temperature inversion can notoriously result in freezing rain in cold climates.
