It caused volcanoes to erupt, heated up Earth's atmosphere and led to a sharp drop in the level of oxygen in the oceans.
(It; led; to a sharp drop in the level of oxygen in the oceans) (It; caused; Earth's atmosphere) Context(It caused,List([0, 9))):(volcanoes; to erupt; )
It caused,List([0, 9))
It It volcanoes
led caused to erupt
to a sharp drop in the level of oxygen in the oceans
Earth's atmosphere