015 100 points why does the sky appear darker blue

015 10.0 points
Why does the sky appear darker blue when
you are at high altitudes?
1. There is less air above you and conse-
quently more scattering of sunlight.
2. There is less sunshine at high altitudes
than at lower altitudes.
3. There is less air above you and conse-
quently less scattering of sunlight. correct
4. There are more red-absorbing molecules
in the air at high altitudes.
Explanation:
Less scattering of sunlight results in a
darker sky.