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Dinosaurs: How they became extinct Something happened 65 million years ago, at the end of the Cretaceous period, something so devastating that it altered the course of life on earth. It seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs living on earth disappeared. So how did these dominant creatures just die off? Was it a slow extinction, or did it happen all of the sudden? These questions bring rise …

…enter the atmosphere but would have blocked the radiation of most surface heat back out into space, therefore causing the ³greenhouse effect². Rising temperatures could have killed off or reduced the activity of plankton, disrupting food chains and also messing up the plankton¹s normal role in converting carbon dioxide to oxygen through photosynthesis. From there it would not have been long for all the dinosaurs to have been suffering, and then to become extinct.