In your own words, explain the difference between physical change and chemical change. Give an example of each from the story.

Do mixtures always have to be in liquid form? Are there any examples in the story that help explain what a mixture is?

The story ends with this sentence:

 

But his voice was lost in the wind, leaving the confused, hungry wolf dancing with anger on the ground, unenlightened about density and the process of lighter-than-air travel.

 

If you could explain lighter-than-air travel to the wolf, how would you explain it?