Iceberg calving is the process where chunks of ice break off from the edge of a glacier or an ice shelf and fall into the ocean. This natural phenomenon occurs when the ice becomes too heavy or when the water underneath erodes the ice, causing it to crack and break away. When an iceberg calves, it can create large waves and contribute to rising sea levels. The calved ice can vary in size, from small pieces to massive icebergs, and is a significant part of the glacial cycle, influencing ocean currents and ecosystems.