anthracite
background
black
carbon
charcoal
coal
combustible
deposits
dirty
ecology
energy
environment
exploitation
extraction
factory
fossil
fuel
geology
group
heap
heat
industrial
industry
isolated
lump
many
material
mine
mineral
mining
natural
nature
object
piece
pieces
pile
plant
pollution
power
production
resource
resources
rock
sedimentary
station
stone
texture
white
work