Question

The Coriolis effect happen when ?

Answer 1

The Coriolis effect is caused by a combination of the inertia of moving air and the rotation of the Earth. Air tends to move from high pressure to low pressure in a straight line, but the rotation of the Earth means that, to an observer at one spot on its surface, the moving air appears to turn.
-Refernence.com

Hope this helped. Good luck!

Answer 2

Well, if there isn't any options, maybe the19th century.?