Furthermore, when air is heated it expands and rises, and when air is cooled it contracts and falls.
(air; is heated; ) (it; falls; T:when air is cooled) (it; expands; T:when air is heated) (it; rises; T:when air is heated) (air; is cooled; ) (it; contracts; T:when air is cooled)
air it it it air it
is heated falls expands rises is cooled contracts
T:when air is cooled
T:when air is heated
T:when air is heated
T:when air is cooled