Multiple choice

The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?

  1. Presence of prominent tropospheric turbulence; and inflow of chlorofluorocarbons.

  2. Presence of prominent polar front and stratospheric clouds; and inflow of chlorofluorocarbons.

  3. Absence of polar front and stratospheric clouds; and inflow of methane and chlorofluorocarbons.

  4. Increased temperature at polar region due to global warming.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The winter stratospheric air over the Antarctic routinely gets colder than the air anywhere else. Because the winter, stratospheric air over most of Antarctica is isolated from warmer, lower altitude air by a strong set of confining winds known as the polar vertex, this air gets so cold that polar stratospheric clouds regularly form between the altitudes of approximately 12 to 25 km. Particles surface in these clouds cause chemical reactions that create even more reactive halogen chemicals.

Keep practicing — related questions