When continents collided, volcanoes erupted building new land and earthquakes trembled, crumbling existing land forms.
(continents; collided; ) (volcanoes; erupted; T:When continents collided) (volcanoes; building; new land) (earthquakes; trembled; )
continents volcanoes volcanoes earthquakes
collided erupted building trembled
T:When continents collided
new land