Raw black coal lump, showing rough texture. Symbolizes industrial energy and environmental concerns.
Schlüsselwörter
coal,
anthracite,
bituminous,
lignite,
stone,
peat,
fossil fuel,
energy,
black,
rock,
mineral,
natural,
raw,
unrefined,
power,
fuel,
industry,
mining,
resource,
solid,
carbon,
heat,
electricity,
combustion,
pollution,
environment,
geologic,
formation,
deposit,
sedimentary,
organic,
dark,
dense,
heavy,
rough,
textured,
earthy,
industrial,
raw material,
fossil
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