Raw coal ,white background
Schlüsselwörter
coal,
raw,
mineral,
unprocessed,
natural,
fossil,
fuel,
black,
combustible,
resource,
energy,
carbon,
underground,
mining,
extraction,
heat,
power,
solid,
formation,
deposit,
burn,
industrial,
geologic,
raw material,
reserve,
non-renewable,
ash,
production,
economical,
environmental,
heavy,
supply,
demand,
smoky,
pollutant,
soot,
seam,
utility,
dust,
geology,
smoulder,
anthracite
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