Today Puzzle #568
Puzzle No. 568鈥� Monday 16 September
If you think you’re having a bad day, well scientists have a recording of the worst day on Earth in the last 66 million years under the Gulf of Mexico. (/news/science-environment-49651406). A meteorite dug a circular hole in the Earth's crust 100km across and 30km deep. This bowl then collapsed leaving a crater 200km across. How deep was it?
Today’s #PuzzleForToday has been set by Dr Shaun Fitzgerald, Director of The Royal Institution
Click here for the answer
The volume of a hole of depth d and radius r is given by d p r2. Given the radius of the crater doubled, then assuming the volume of the hole remained the same, the depth of the crater reduced by a factor of 4 so the new crater was 7.5km deep.
-
![]()
Puzzle for Today 鈥� Index
Find all of the currently available Puzzles for Today, with answers.
More fiendish brain-teasers and quizzes on 麻豆官网首页入口 Radio...
-
![]()
From autumn leaves to the magic roundabout: test yourself with our favourite quizzes.
-
![]()
We asked the intelligence agency to set our listeners a code-cracking challenge... Can you solve it?
-
![]()
Quiz: How many of these Mastermind music questions can you answer?
Here's a chance to find out whether your specialist subject on Mastermind could be the entire history of music.
-
![]()
Six conundrums to grapple with, including the Riddle of the Sphinx. Try not to forfeit your life...
