Thread by @Rainmaker1973

This impressive photo by Keri Lee Nelson shows us a mushroom-shaped iceberg. Part of a larger iceberg that's slowly shedding weight via calving, as it loses weight the smooth part (which has been submerged for some time) is rising out the water [source: buff.ly/2QLLvRd]

This mushroom iceberg was observed in 1912 by Frank Hurley, who visited Antarctica as a member of the First Australasian Antarctic Expedition, 1911-1914 [source: buff.ly/3jDM9wI]

Sometimes mushroom-shaped icebergs can look like something else. This is an iceberg shaped like a dragon, towering ~ 15 feet above the waters of Muir Inlet, Glacier Bay National Park, Alaska [source: buff.ly/2EUK7cj]

Sometimes icebergs can look like mushrooms even though the formation mechanism is a bit different and more closely related to the one producing pinnacles, like this one captured by Joseph Tennein the Soty Shetland Islands by the Antarcrtic Peninsula buff.ly/31UVlH3