Cecil writes the equation for the reaction of hydrogen and oxygen below. H2 + O2 → H2O
Why does his teacher ask him to balance the equation by including the correct coefficients?

A- to show that most molecules exist in pairs

B- to show that most compounds exist in pairs

C- to show that atoms are conserved in chemical reactions

D- to show that atoms are created in chemical reactions

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.