NASA finds rectangular iceberg in Antarctica

The video discusses a tabular iceberg photographed over Antarctica, believed to have fractured from the Larsen Sea Ice Shelf. It contrasts tabular icebergs, which have flat surfaces and steep sides, with angular icebergs that typically have only the tip visible. Tabular icebergs form when ice shelves grow and break off, often resulting in straight lines. Sharp corners on an iceberg suggest it is new, as wind and waves usually round them out over time.

What does the sharpness of an iceberg's corners indicate?

What usually happens to the shape of icebergs due to wind and waves?