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[[File:Antarctic Sound-2016-Iceberg 02.jpg|300px|left]]
[[File:Mount-Petras.png|300px|left]]
An '''[[iceberg]]''' is a large piece of freshwater [[ice]] that has broken off a [[glacier]] or an [[Ice-shelf|ice shelf]] and is floating freely in open water. It may subsequently become frozen into [[pack ice]] (one form of sea ice). As it drifts into shallower waters, it may come into contact with the seabed, a process referred to as seabed gouging by ice. About 90% of an iceberg is below the surface of the water.
'''[[Mount Petras]]''' is a 2865 meter high prominent mountain in the shape of a ridge in [[Westarctica]]. The mountain is located 16 kilometers southeast of Mount Flint in the [[McCuddin Mountains]].


Because the density of pure [[ice]] is about 920 kg/m3, and that of seawater about 1025 kg/m3, typically about one-tenth of the volume of an iceberg is above water (which follows from Archimedes's Principle of buoyancy). The shape of the underwater portion can be difficult to judge by looking at the portion above the surface. This has led to the expression "tip of the iceberg", for a problem or difficulty that is only a small manifestation of a larger problem.
The ancient volcanic deposits at Mount Petras provide the oldest terrestrial evidence for [[glacier|glacial ice]] in Marie Byrd Land. The relatively high relief pre-volcanic environment is suggestive of ongoing erosion and is inconsistent with previous interpretations of a regional, low relief, early Cenozoic West Antarctic Erosion Surface.


Icebergs are monitored worldwide by the U.S. National Ice Center (NIC), established in 1995, which produces analyses and forecasts of Arctic, [[Antarctic]], Great Lakes and Chesapeake Bay ice conditions. More than 95% of the data used in its sea ice analyses are derived from the remote sensors on polar-orbiting satellites that survey these remote regions of the Earth.
Scientists from the United States [[Antarctic]] Service Expedition (1939-1941) discovered Mount Petras during a flyover between 14 and 15 December 1940. The mountain was named in honor of Theodore Argyrios Petras (1911 - 2004), a master technical sergeant in the US Marine Corps, who served as the pilot of this flight.


'''([[Iceberg|Full Article...]])'''
On 5 May 2015, the [[Peerage of Westarctica|peerage title]] Baroness of Petras was granted to Leila Rozumski as a gift from her mother, Jennifer.
 
'''([[Mount Petras|Full Article...]])'''

Revision as of 19:00, 1 July 2019

Mount-Petras.png

Mount Petras is a 2865 meter high prominent mountain in the shape of a ridge in Westarctica. The mountain is located 16 kilometers southeast of Mount Flint in the McCuddin Mountains.

The ancient volcanic deposits at Mount Petras provide the oldest terrestrial evidence for glacial ice in Marie Byrd Land. The relatively high relief pre-volcanic environment is suggestive of ongoing erosion and is inconsistent with previous interpretations of a regional, low relief, early Cenozoic West Antarctic Erosion Surface.

Scientists from the United States Antarctic Service Expedition (1939-1941) discovered Mount Petras during a flyover between 14 and 15 December 1940. The mountain was named in honor of Theodore Argyrios Petras (1911 - 2004), a master technical sergeant in the US Marine Corps, who served as the pilot of this flight.

On 5 May 2015, the peerage title Baroness of Petras was granted to Leila Rozumski as a gift from her mother, Jennifer.

(Full Article...)

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