Post-Glacial Rebound and Earth's Rotation · CAP 2010 #Q13
Physics · mechanics
Problem
If the Earth's polar land-based glaciers melted, water would be redistributed on the planet, and the depression in the earth's crust made by the weight of the ice would rebound, as the land rises when the weight of the glaciers is removed (an effect known as Post-Glacial Rebound or Glacial Isostatic Adjustment). Following post-glacial rebound, the length of day would
a) increase;
b) decrease;
c) remain the same as the present length of day;
d) at first increase but then shortly return to the present length of day;
e) at first decrease but then shortly return to the present length of day.