Pile of irregular coal pieces stacked together isolated on white background
Schlüsselwörter
coal,
fuel,
energy,
rock,
carbon,
mineral,
pile,
deposit,
resource,
anthracite,
lump,
piece,
fossil,
power,
heat,
industry,
natural,
material,
hard,
formation,
geology,
element,
substance,
source,
combustion,
extraction,
white,
background
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