After an eruption, the entire sky looks red (it normally looks blue). Why is doe

Question

After an eruption, the entire sky looks red (it normally looks blue). Why is does this happen? (Hint: Large ash particles scatter red light more efficiently than air molecules do):

A) Green light is absorbed by the volcanic ash leaving only red light.
B) Some of the fire from the volcano has spread overhead.
C) The winds have blown lots of volcanic ash particles overhead which efficiently rayleigh scatter red light because they are larger than air molecules.
D) The scattered blue light from the sky is efficiently absorbed by the volcanic ash, leaving only red light.

Explanation / Answer

C) The winds have blown lots of volcanic ash particles overhead which efficiently rayleigh scatter red light because they are larger than air molecules.

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