Reply to post: Approx

Bombing raids during WWII sent out shockwaves powerful enough to alter the Earth's ionosphere

Rich 11 Silver badge

Approx

about 1,000 kilometers (about 621 miles)

It's OK to say "about 600 miles" rather than reach for the calculator and quote the conversion exactly.

POST COMMENT House rules

Not a member of The Register? Create a new account here.

  • Enter your comment

  • Add an icon

Anonymous cowards cannot choose their icon

Biting the hand that feeds IT © 1998–2019