Which of the following describes a primary role of global circulation cells in a planet's atmosphere?
A) They transport heat from the equator toward the poles.
B) They create severe weather such as thunderstorms.
C) They cause air to be diverted into hurricane-like swirls.
D) They keep the poles cold enough to have polar caps.
A
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According to astronomers, the Milky Way is _____
A) wheel shaped B) hexagonal C) rectangular D) bell shaped
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
When three vectors, 
, 
, and 
are placed head to tail, the vector sum + + = 0. If the vectors all have the same magnitude, the angle between the directions of any two adjacent vectors is
A. 30°
B. 60°
C. 90°
D. 120°
E. 150°
During a period of high solar activity, the corona
A) becomes smooth and even. B) cools almost to the temperature of the photosphere. C) disappears. D) shrinks to half its normal size. E) is more irregular.
The constellation shaped like a big square (the "great square of . . . "), which can be used to help locate the March equinox in the sky, is
A) Cassiopeia. B) Pegasus. C) Canis Major. D) Taurus. E) Andromeda.