How is a glacial crique formed?

Answer 1

I think you mean a cirque. Cirques form when a glacier carves out a depression in a mountain. It can eventually fill with water to make a lake called a tarn.

Answer 2

A glacial cirque is formed when a glacier erodes the headwall of a valley through processes like plucking and abrasion. As the glacier moves downhill, it creates a bowl-shaped depression with steep walls. After the glacier retreats, the cirque may fill with water, forming a tarn or glacial lake.