What was one of the biggest factors leading to our current reality, in which people are always connected or "always on"?
A. The affordability of cell phone service
B. The availability of public pay phones
C. The number of cafés with Internet access
D. The expense of personal computers

he sent troops to protect the students as they entered the school.

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:

the commander in chief

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth