"Iceberg" Natural Recordings by Native Speakers
An iceberg is a large piece of ice that floats in the ocean. It is formed when a glacier or ice shelf breaks off and melts partially underwater, with the remaining portion above the water's surface. Unlike floating ice, which melts completely soon after hitting the water, an iceberg remains intact because only a portion of its mass is above the waterline. The oceanic portion of the iceberg may be thousands of feet deep, while the visible portion may be just a few feet above the surface.