How did the dinosaurs die?

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ncchemist | eNotes Employee

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There is no single consensus answer as to what happened to the dinosaurs.  There have been many theories floated through the years as to why the dinosaurs disappeared from the Earth, including disease, climate change, and a change in their food source (vegetation).  But most scientists now believe that some type of violent, impact event occurred that is commonly referred to as the Cretaceous-Paleocene impact event.  There is a massive impact crater on the coast of southern Mexico called the Chicxulub Crater where a massive asteroid smashed into the Earth.  There is also an increase in iridium levels in the rock strata around the world from 65 million years ago that originated from this impact.  The impact of the crater and the ensuing climate change that followed is what likely caused the mass extinction of the dinosaurs.

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