Answer: Icebergs are produced when large pieces of ice break off from the front of a glacier during a process called calving.
Step-by-step explanation:
A glacier breaks into pieces and forms icebergs.
The process of breaking of a glacier into icebergs when large pieces of ice breaks is known as calving.
Or we can also say that icebergs are produced when large pieces of ice break off from the front of a glacier during a process called calving.