Answer:
An iceberg is a chunk of a glacier that has broken away and floats free in the ocean.
An iceberg is a large chunk of ice broken off from a glacier or from an ice shelf such as those in Antarctica. They can be very large. The Titanic hit a towering iceberg, but the damage was done below the surface. Only 10 percent of an iceberg sits above the surface of the water.
The largest recorded iceberg was 28 miles wide and 208 miles long.