Why does an aerial firework require two explosions of black powder

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

Building glycogen from glucose molecules is an example of