In the Northern Hemisphere, Seasonal Variation in Temperatures Is Caused

Multiple Choice

In the Northern Hemisphere, seasonal variation in temperatures is caused mainly by ____.

A) the Earth's elliptical orbit taking it closer to and farther away from the sun
B) the Earth's tilt on its axis of 23.5^o
C) seasonal variation of energy output from the sun
D) warm equatorial air masses rising and spreading north and south
E) uneven warming of the ocean's surface water