The Earth area of permanent human settlement is called the
A) hot zone.
B) civilized world.
C) geophenom.
D) ecumene.
E) subpolar region.
Question 2
Why are cT air masses of minor importance for the U.S.?
A) Prevailing winds steer them away. B) Upper level subsidence limits their formation.
C) Mountains block their approach. D) No large source region is near the U.S.