Temperature variations over a period of time allow the rock to expand and contract repeatedly causing curved-shaped pieces to break off.
(the rock; to contract; T:repeatedly) (Temperature variations over a period of time; allow; the rock to expand and contract repeatedly) Context(Temperature variations over a period of time allow,List([0, 50))):(the rock; to expand; )
Temperature variations over a period of time allow,List([0, 50))
the rock Temperature variations over a period of time the rock
to contract allow to expand
T:repeatedly
the rock to expand and contract repeatedly