Many United States weather maps throughout the year will look similar to the one above. Which explanation best describes the cause of this
phenomenon?
A Evaporation of ocean water creates fronts that approach the
United States from both coasts.
B The west coast of the United States is normally colder than the
east coast.
C Ocean waves cause movement in the air masses in the same
direction.
D The unique shape of the United States land mass cause these
weather patterns to occur regularly.