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The Earth is divided into 24 time zones. The Earth rotates 15 degrees in one hour, so each time zone equals 15 degrees of latitude. The map illustrates the four time zones across the continental United States. As a traveler moves west, she can expect to _________.

A Move into an earlier time zone for every 15 degrees of latitude she travels.

As illustrated on the map, a traveler would enter an earlier time zone as he or she moves west. According to the caption, each time zone “equals 15 degrees of latitude.”

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