What are the major theories explaining the disappearance of the dinosaurs?

Meteorites and Volcanic Eruptions/ Lack of resources after these events occurred

Explanation:

The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event, was about 66 million years ago. It may be called the K/T extinction event or K/Pg event for short. This is the famous event which killed the dinosaurs at the end of the Cretaceous period.

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