Iridescent clouds are created by the process of:
A) reflection. B) scattering. C) diffraction. D) refraction.
Question 2
Which of the following was not an impact of the Mount Pinatubo eruption in June 1991?
A) A decrease in atmospheric aerosols
B) Injection of 15 - 20 million tons of sulfur dioxide droplets into the stratosphere
C) Worldwide transport of aerosols
D) A temporary average cooling of 0.5 C (0.9 F)
E) Increase in atmospheric albedo