As the balloon rises, the air pressure outside the balloon decreases, and the balloon is stretched by the gas inside the balloon as the pressure attempts to equalize.
(the balloon; rises; ) (the air pressure outside the balloon; decreases; T:As the balloon rises) (the balloon; is stretched; by the gas inside the balloon; T:as the pressure attempts to equalize) (the pressure; attempts; to equalize)
the balloon the air pressure outside the balloon the balloon the pressure
rises decreases is stretched attempts
T:As the balloon rises
by the gas inside the balloon T:as the pressure attempts to equalize
to equalize