Railroad tracks wind their way through the mine transporting coal to the surface.
Palabras clave
railroad,
track,
wind,
way,
mine,
transporting,
coal,
surface,
natural,
resource,
renewable,
energy,
fossil,
fuel,
extraction,
mineral,
preserving,
sustainability,
pollution,
industrial,
factory,
consumption,
environment,
industry,
technology,
electric,
plant,
electricity,
ecology,
gasoline
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