What is a negative feedback loop? a closed path that tends to reduce the activity of a body system
the output of a system stimulates another cycle of the system
anything that causes a reaction or response
something that carries out a response

A negative feedback loop is a closed path that tends to reduce the activity of a body system.

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.