It can be as quick as a flash flood or landslide which may take seconds, or as long as a river cutting its path through the land.
(It; can be; as quick as a flash flood or landslide) (a flash flood or landslide; may take; seconds; T:as long as a river cutting its path through the land) (a river; cutting; its path; through the land)
It a flash flood or landslide a river
can be may take cutting
as quick as a flash flood or landslide
seconds T:as long as a river cutting its path through the land
its path through the land