Which month recorded the lowest amount of ozone over the Antarctic?

Since then, concentrations below 100 became more common. The deepest ozone hole occurred in 1994, when concentrations fell to just 73 DU on September 30.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.