warehouse for retail sale of coal to the population.trade in natural resources and minerals.heating season in houses. energy for t

abstract agriculture and background black blast bulldozer burning cargo coal combustion construction daily dig digger dust ecology energy equipment excavation extraction for fuel furnaces gold gravel gray heating heavy houses industrial industry indystry job material mineral mineralsheating natural nature pattern plants plow populationtrade power reserves resource resources retail road routine sale season ship sorting stone strategic street surface technology texture texturebackground textured thermal transportation wall warehouse wealth work yellow