Stacked, rough dark rocks
Schlüsselwörter
rock,
stone,
dark,
rough,
texture,
grey,
mineral,
black,
geology,
natural,
pile,
stack,
solid,
heavy,
material,
resource,
coal,
carbon,
fuel,
energy,
earth,
ground,
formation,
geologic,
clump,
chunk,
fragment,
bit,
aggregate,
block,
deposit,
graphite,
anthracite,
bituminous,
lignite,
hardness,
surface,
shiny,
crystalline,
opaque,
rugged,
weathered,
dense,
compact,
hard,
shale,
slate,
ore
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