Icebergs are large masses of freshwater ice that have broken off from glaciers or ice shelves and float in the ocean. They are primarily found in polar regions, such as the Arctic and Antarctic. About 90% of an iceberg's volume is submerged underwater, making them difficult to see and posing hazards to ships. Icebergs come in various shapes and sizes, with some towering over 100 feet above the water's surface. They can be classified into different types, including tabular icebergs, which have flat tops, and pinnacled icebergs, which have sharp peaks. Icebergs play a crucial role in the Earth's climate system by reflecting sunlight and influencing ocean currents.