According to the polar front theory, midlatitude cyclones
A) are born in the tropics.
B) form over large oceanic areas with uniform surface temperature.
C) last only one to three days.
D) cover large portions of a continent and bring precipitation to wide areas.
Question 2
According to the polar front theory, cyclogenesis begins when
A) cold air begins to rise above the warmer air.
B) an occluded front is formed.
C) cold air begins to advance northward and warm air begins to advance southward.
D) cold air begins to advance southward and warm air begins to advance northward.
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
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Three polar bears investigate an American submarine that surfaced in ice-covered Arctic waters.