“If a comet, which would have been traveling at about 30 miles per second, impacted Earth’s atmosphere, it would have created a flash of extreme heat reaching about 3,000 to 4,000 degrees Fahrenheit (1,600 to 2,200 degrees Celsius).”
I bet that’s how we got red hot chili peppers. Aiee! Carramba! (Sic)
Not to mention outgassing, mucho outgassing.