An iceberg is a large piece of ice floating in the sea. They are generally found in cold water near the North or South Pole. ... Icebergs break off from larger structures made of ice, like glaciers or ice shelves. These are formed by snowfall in very cold places where it will not melt in the summer. Icebergs are also classified by their shape. Tabular icebergs have steep sides and a flat top like a plateau, while non-tabular icebergs include irregular shapes such as rounded tops, spires, sloping sides, and blocks. Wind and water erode icebergs into amazing sculptural shapes.
Icebergs are dangerous because they are huge and they float low in the water which can cause danger to the ships. They tend to flip over at times. When they flip over the energy is so great it can cause tsunamis and on occasion can trigger earthquakes.