Pile of coal chunks isolated on white background (4)
Schlüsselwörter
coal,
chunk,
pile,
rock,
black,
fuel,
energy,
isolated,
white,
background,
mineral,
mining,
industry,
fossil,
resource,
power,
geology,
nature,
earth,
natural,
raw,
material,
production,
substance,
deposit,
supply,
source
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