Which of the following phenomena occurs in the mesosphere?

The phenomenon that occurs in the mesosphere is falling stars, which are commonly known as meteors. This layer of the Earth's atmosphere, located approximately 50 to 85 kilometers above the Earth's surface, is where meteoroids, when entering the atmosphere at high speeds, begin to burn up due to friction with the air. This process produces the bright streaks of light that we see as meteors or "shooting stars."

The mesosphere is distinct from other layers of the atmosphere in terms of its characteristics and processes. Unlike the stratosphere, where the ozone layer is located that filters ultraviolet rays, and the troposphere, where weather phenomena such as clouds and storms occur, the mesosphere does not support these activities. Instead, it is primarily characterized by the presence of meteoroids entering the atmosphere and producing the visible light of meteors as they disintegrate. Thus, the activity related to falling stars is specifically associated with the mesosphere.