Physical geography of China Has large coal reserves Borders the South China Sea ? A. Is separated from India by the Himalayas B. Is mostly covered in heavily forested plateaus
C. Is forced to buy nearly all its oil from other countries O
D. Has a climate that is hot and humid for almost the entire year​

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: