Regarding troughs and ridges, it is true that:
A) they most closely approximate a spiral pattern.
B) troughs are associated with high pressure.
C) there is always an equal number of troughs and ridges across the continental United States.
D) height contours for troughs are shifted toward the equator.
Question 2
The precipitation conditions in the Sahel are most influenced by the position of:
A) the Polar-Front Jet Stream.
B) the Subtropical Jet Stream.
C) the Lower Level Jet Stream.
D) the Inter-Tropical Convergence Zone.
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