Glaciation can take about years, whereas deglaciation requires about years.

Glaciation can take about 100,000 years, whereas deglaciation requires about 10,000 years.
Glaciation is the movement, formation, and recession of glaciers, it has much more extensive in the past. A glacial period has an interval of time of thousand years within an ice age, whereas a deglaciation is a disappearance of ice or melting of ice from the glaciated region.

Ithink it’s bill gates.