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Instructions: Choose one answer from each pair of selections. To see a sundog or halo, it is important that the cloud be composed of ICE CRYSTALS | WATER VAPOR.

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A ring of light encircling the sun or moon could be either ____.


A) a rainbow or a halo
B) a halo or a sundog
C) a halo or a corona
D) a sundog or a crepuscular ray

E) A) and B)
F) A) and C)

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A mirage is caused by ____.


A) scattering of light by air molecules
B) the bending of light by air of different densities
C) a thin layer of moist air near the ground
D) reflection of light from a hot surface

E) A) and D)
F) B) and C)

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Sunlight reflecting off ice crystals produces ____.


A) crepuscular rays
B) halos
C) sun pillars
D) sun dogs

E) A) and B)
F) B) and D)

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Mirages can be produced by either a very cold or very hot layer of air next to the ground.

A) True
B) False

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What color would the sky be if air molecules selectively scattered only the longest wavelengths of visible light?


A) white
B) blue
C) red
D) black

E) B) and D)
F) A) and B)

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At sunset in the middle latitudes, look for a rainbow toward the ____.


A) north
B) south
C) east
D) west

E) All of the above
F) None of the above

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Secondary rainbows occur when ____.


A) two internal reflections of light occur in each raindrop
B) light refracts through ice crystals
C) a single internal reflection of light occurs in each raindrop
D) light refracts through a cloud of large raindrops

E) C) and D)
F) B) and C)

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Red sunsets, blue moons, and milky-white skies are primarily the result of light ____.


A) refraction
B) dispersion
C) reflection
D) scattering

E) B) and C)
F) A) and B)

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Instructions: Choose one answer from each pair of selections. The sky appears blue because air molecules are LARGER | SMALLER than the wavelength of visible light and selectively scatter the shorter wavelengths.

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Instructions: Choose one answer from each pair of selections. Because of the bending of sunlight by the atmosphere, the sun will appear to rise about two minutes EARLIER | LATER than it would if there were no atmosphere.

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Cloud iridescence is caused mainly by ____.


A) refraction
B) reflection
C) diffraction
D) dispersion

E) A) and B)
F) None of the above

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Instructions: Choose one answer from each pair of selections. A(n) INFERIOR | SUPERIOR mirage can sometimes be seen in the distance while standing on a snow surface during winter.

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This can only be seen when the sun is to your back and it is raining in front of you.


A) sundog
B) halo
C) rainbow
D) sun pillar

E) B) and D)
F) B) and C)

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As a cloud grows larger and taller, ____ sunlight is reflected from it and ____ light can penetrate all the way through it.


A) more; more
B) less; more
C) more; less
D) less; less

E) None of the above
F) B) and D)

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Instructions: Choose one answer from each pair of selections. When white light passes through a glass prism, RED | VIOLET light bends the least.

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A wet-looking road surface on a clear, hot, dry day is an example of a ____.


A) mirage
B) halo
C) Fata Morgana
D) parhelia

E) None of the above
F) B) and C)

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Instructions: Choose one answer from each pair of selections. To see a rainbow in the morning, you should look TOWARD | AWAY FROM the sun.

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White light is a ____ of electromagnetic radiation.


A) single long wavelength
B) single short wavelength
C) mixture of all visible wavelengths
D) mixture of all wavelengths

E) All of the above
F) A) and D)

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Distinguish between the processes of reflection, refraction, and scattering of light. Give an example of an atmospheric phenomena produced by each one. Which of these processes produces dispersion?

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Light is scattered when visible light is...

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