About 66 million years ago the Cretaceous–Paleogene (K–Pg) extinction event wiped out about 80% of life on Earth, and no one is exactly sure what caused it. Here’s a list of the current theories though!
- Asteroid/comet — metal and rock/ ice, dust, rocky materials and organic compounds
- Global firestorm (caused by asteroid)
- Hypercanes, also known as giant giant hurricanes, which not only devastated those who came in their paths but also were high enough to damage the ozone layer
- Gradual extinction and competition with mammals (aka the boring theory)
- Continental drift, which changed habitats and climates as ocean patterns changed
- Sea level changes
- Disease
- Volcanoes spewing sulfur for 10,000 years
- Any of these combining in a short amount of time
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