Why does the iceberg have only one tip?

Icebergs mostly form in spring and summer, when warmer weather accelerates the breakup of glaciers or ice sheet edges. The mutual movement of ice and seawater causes the end of the glacier or ice sheet to break into the sea and become an iceberg. There is also a type of glacier that extends into the sea water, and the upper part melts or evaporates quickly, turning it into an underwater ice shelf, which breaks off and then resurfaces. Most icebergs have a density of 0.9, so 6/7 of their mass is below the surface. The tip of the iceberg above the water is only 1/10 of the entire iceberg.