Akind of sedimentary rock formed from plant material over a long period of time is

Coal is a sedimentary rock made almost entirely of plant material and other organic deposits that have been buried for millions of years under elevated conditions of heat and pressure. 

The answer is coal, because it is made up of dead plants that are buried, then are chemically 

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.

Heatamount of salt . . .