Noctilucent clouds, meaning luminous night clouds are best seen at ____, during the ___

Noctilucent clouds, meaning luminous night clouds are best seen at ____, during the ____ at latitudes poleward of 50 degrees.
a. sunset; winter
b. sunrise; fall
c. sunrise; spring
d. twilight; winter
e. twilight; summer

Question 2

Nacreous clouds form in the ____.
a. troposphere
b. stratosphere
c. ionosphere
d. mesosphere
e. thermosphere

Question 3

Mammatus clouds most frequently form on the underside of ____ clouds.
a. cumuloaltus
b. stratus
c. cirrus
d. nimbostratus
e. cumulonimbus

Question 4

When a cloud forms over and extends downwind of an isolated mountain peak, it is called a ____ cloud.
a. lenticular
b. banner
c. cap
d. pileus
e. mammatus

Question 5

In 1887, Ralph Abercromby and Hugo Hildebrandsson expanded Howards original cloud classification system and published a classification system that, with only slight modification, is still in use today. In their system, ____ principal cloud forms are divided into ____ primary cloud groups.
a. eight; two
b. nine; three
c. ten; four
d. eleven; five
e. twelve; six

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Noctilucent clouds, meaning luminous night clouds are best seen at , during the at ...

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Noctilucent clouds, meaning luminous night clouds are best seen at ____, during the ____ at ...

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Noctilucent clouds, meaning luminous night clouds are best seen at , during the at ...