If Earth's atmosphere were appreciably thicker, snow would appear
A) still white.
B) yellow.
C) blue.
D) ultraviolet.
Question 2
A setting Sun appears red due to
A) scattering of lower frequencies by larger particles in the air.
B) light's longer path through air at sunset.
C) lower frequencies of light emitted during sunset.
D) absorption by smaller particles in the air.