Earth's mean surface temperature remains about the same because — A. incoming solar energy is balanced by outgoing radiation
B. more solar energy is absorbed by land than by oceans
C. most of the sun's radiation that passes through the atmosphere is infrared radiation
D. outgoing solar radiation that escapes the atmosphere is in the visible spectrum

Covalent bond is the correct answer

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.