Yeah, me too. 90 ft wide is enough to take out at least a couple hundred square miles.
High school physics question: What is amount of energy released in joules by an impact from a iron sphere 30 meters in diameter (density of iron = 7870 kg/m^2) hitting the earth at a speed of 15 km/s?
Bonus: Convert your answer to megatons.
Answer: 8.683*10^15 j, or 2.075 megatons.
That’s a big boom.