Explain how human activities have altered our climate.

use of oil in many ways affects the atmosphere and therefore the climate

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."

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: