As the water freezes it expands and exerts a force on its surroundings.
(the water; freezes; ) (it; expands; T:As the water freezes) (it; exerts; a force on its surroundings; T:As the water freezes)
the water it it
freezes expands exerts
T:As the water freezes
a force on its surroundings T:As the water freezes