Which of the following is true about the Earth's atmosphere?
A) It allows gamma rays and X-rays reach the surface.
B) The ozonosphere and ionosphere shield the surface from harmful radiation.
C) Variable gases are the dominant gases in the atmosphere.
D) It is denser at higher altitudes.
Question 2
The Intertropical Convergence Zone is characterized by
A) cold, dry rising air.
B) cold, dry sinking air.
C) warm dry rising air.
D) warm, wet rising air.