The picture below shows a common human activity

what are examples this kind of pollution may cause?
a acid rain, which may cause diseases such as asthma
b global warming, which may cause diseases such as skin cancer
c respiratory diseases such as emphysema
d artificial eutrophication, harming aquatic animals

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.