There are several types of ice, each formed under different conditions. The most common type is glacial ice, which forms from compacted snow over long periods. This ice is found in glaciers and ice sheets, primarily in polar regions. Another type is sea ice, which forms when ocean water freezes, creating a layer of ice on the surface of the sea. Frazil ice is another type, consisting of small, needle-like ice crystals that form in turbulent water. Pack ice refers to large areas of sea ice that have broken up and drifted together. Lastly, icebergs are large chunks of freshwater ice that break off from glaciers and float in the ocean.