Amazon.com description: Product Description: Global communication and travel are integral parts of culture today. Knowing the time of the places around the world makes interacting globally easier! The 24 time zones on Earth make this possible. Readers are introduced to these important zones, including how they began in the United States with railroad lines. Detailed, full-color maps offer practice reading maps as basic concepts, such as latitude and longitude, are incorporated into the main content. Fun facts about Daylight Saving Time and irregularly drawn time zones will interest readers while they gain knowledge supportive of the social studies curriculum.