@CNN: Was the mass extinction triggered by the asteroid, was it a series of volcanic eruptions over thousands of years, or did the combined power cause this event? Skepticism has emerged in the scientific community. https://t.co/uI3nf2c5HH

Was the mass extinction triggered by the asteroid, was it a series of volcanic eruptions over thousands of years, or did the combined power cause this event? Skepticism has emerged in the scientific community. https://t.co/uI3nf2c5HH

— CNN (@CNN) February 22, 2019