A single lump of coal isolated on white background
Schlüsselwörter
coal,
fuel,
energy,
rock,
carbon,
mineral,
resource,
fossil,
power,
deposit,
anthracite,
substance,
material,
element,
formation,
geology,
industry,
source,
sediment,
chunk,
piece,
fragment,
object,
sample,
specimen,
natural,
isolated,
white,
background
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