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Nacreous (also known as mother of pearl or stratospheric) clouds.  These clouds form at around 20km altitude in the ozone layer and are instrumental in the process of ozone depletion.  Because of their altitude they remain illuminated by the sun, long after sunset on the ground.
Nacreous (also known as mother of pearl or stratospheric) clouds. These clouds form at around 20km altitude in the ozone layer and are instrumental in the process of ozone depletion. Because of their altitude they remain illuminated by the sun, long after sunset on the ground.

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