Which characteristic describes the troposphere? A. contains the ozone layer
B. has the highest air pressure
C. spans 12–50 km above Earth
D. is a good place for planes to fly

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.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

What forms when chemical reactions combine pollution with sunlight?