Which of the following statements about nacreous clouds is correct 1 Nacreous clouds ...........

Geography World climates

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Which of the following statements about nacreous clouds is correct.

1. Nacreous clouds are near stratospheric troposphere clouds.

2. They are also called ‘mother-of-pearl’ clouds.

3. They are absent in polar-regions.

Choose the correct alternative.

1 and 2 only

1 and 3 only

2 and 3 only

2 only

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Explanation:

Polar stratospheric clouds or PSCs, also known as nacreous clouds ( mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters (49,000–82,000 ft). They are best observed during civil twilight when the sun is between 1 and 6 degrees below the horizon as well as in winter and in more northerly latitudes. They are implicated in the formation of ozone holes.