The best synonym for "expand" in this context would be "increase in volume."
Collide
The best synonym for "expand" is "enlarge." Both terms convey the idea of increasing in size, scope, or extent. Other possible synonyms include "broaden" and "extend," but "enlarge" closely captures the essence of the word.
Collide
rule :) A+
Counting
Cow.
blood
forever
counting
orbit
Remonstrations