The correct answer is:
- Thousands of years
Postglacial rebound, also known as isostatic rebound, is the gradual rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period. When continental ice sheets melt, the land slowly begins to rise back up over a long period of time. This process can take thousands of years as the Earth's crust adjusts to the removal of the ice load.
During this period, the land slowly rebounds due to the readjustment of the Earth's mantle beneath the crust. It is a slow process that occurs over thousands of years and can vary depending on factors such as the size of the ice sheet and the geology of the region.
So, it's not a matter of weeks, a year, or millions of years, but rather a process that takes thousands of years for the land to fully rebound after the melting of continental ice sheets.
