So he was sitting around with the other students when all of a sudden a large noise came from over near where Professor Airey was. He squinted his eyes and scrunched his nose at the sound of the balloon bursting. Thank Merlin that the balloon was gone. Now he didn't have to get so worried. Well at least the balloon hadn't flown at his face. Phew. A little bit of tension left from his shoulders.

Oh good idea. They would keep moving so that they would all stay warm and not freeze their butts off. Simon got to his feet rather energetically. Then Airey joined them and led them on the jog. He asked them to think about what pressure, temperature, volume, and density. He blinked his blue eyes a couple of times and then began to raise his hand. Wait. They could just shout it out. "Weather!" he cried, beaming. Oh yes, he knew that answer and felt very proud because of it.