A pile of dark coal rocks showing texture and form
Schlüsselwörter
coal,
rock,
dark,
black,
texture,
energy,
fuel,
power,
mining,
geology,
mineral,
fossil,
stone,
pile,
heap,
lump,
rough,
surface,
background,
isolated,
source,
combustion,
industrial,
raw,
material,
anthracite,
bituminous,
lignite,
carbon,
element,
earth,
resource,
industry,
generation
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