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Large fires can produce dark clouds similar to large cumulus.
Combustion products may be carried by the wind to great distances
and occasionally cause a blue appearance of the sun or moon.
Real cumulus may also form.
Volcanic eruptions may cause large cumulus-like clouds to
form, which can spread out at high altitudes over vast areas.
The sky then assumes a peculiar tint, which may persist
for several weeks. Very large explosions are usually accompanied
by a cloud of smoke or dust above which velum is often seen.
Industrial activities may also produce clouds. The photograph
here shows cumulus produced by a power station (cirrostratus
is also on the horizon).
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