When you arrive at these coordinates, you should see this basalt rock formation in front of you. This formation and the cliffs beside it is called Brown Bluff. 
Your task is to read the text below and learn about the classification and names for different icebergs. There WILL be icebergs all around you. Take a picture of one that you can get in the picture with any of the brown bluff area. You will need to include the size and the type of iceberg. If you are on a cruise you will probably need to go outside so you can get a picture of youself, or a card with your geocaching name on it. Shadows from walls and balconies make it hard to get a clear picture. The picture should be of you, the brown bluff area, and the iceberg.
An iceberg is a piece of freshwater ice more than 15 m long that has broken off a glacier or an ice shelf and is floating freely in open (salt) water. Smaller chunks of floating ice from glaciers are called "growlers" or "bergy bits". The sinking of the Titanic in 1912 led to the formation of the International Ice Patrol in 1914. Much of an iceberg is below the surface, which led to the expression "tip of the iceberg" to illustrate a small part of a larger unseen issue. Icebergs are considered a serious maritime hazard. Icebergs vary considerably in size and shape.
|
Iceberg size classifications according to the International Ice Patrol
|
|
Size class
|
Height (m)
|
Length (m)
|
|
Growler
|
<1
|
<5
|
|
Bergy bit
|
1–5
|
5–15
|
|
Small
|
5–15
|
15–60
|
|
Medium
|
15–45
|
60–122
|
|
Large
|
45–75
|
122–213
|
|
Very large
|
>75
|
>213
|
Icebergs that calve from glaciers in Greenland are often irregularly shaped while Antarctic ice shelves often produce large tabular (table top) icebergs.
The largest icebergs recorded have been calved, or broken off, from the Ross Ice Shelf of Antarctica. Winds and currents may move icebergs close to coastlines, where they can become frozen into pack ice (one form of sea ice), or drift into shallow waters, where they can come into contact with the seabed, a phenomenon called seabed gouging.
Shape
Tabular iceberg, near Brown Bluff in the Antarctic Sound.
In addition to size classification (Table 1), icebergs can be classified on the basis of their shapes. The two basic types of iceberg forms are tabular and non-tabular. Tabular icebergs have steep sides and a flat top, much like a plateau, with a length-to-height ratio of more than 5:1.
This type of iceberg, also known as an ice island, can be quite large, as in the case of Pobeda Ice Island. Antarctic icebergs are formed by breaking off from an ice shelf, such as the Ross Ice Shelf or Filchner-Ronne ice shelf, are typically tabular.
The largest icebergs in the world are formed this way.
Non-tabular icebergs have different shapes and include:
- Dome: An iceberg with a rounded top.
- Pinnacle: An iceberg with one or more spires.
- Wedge: An iceberg with a steep edge on one side and a slope on the opposite side.
- Dry-dock: An iceberg that has eroded to form a slot or channel.
- Blocky: An iceberg with steep, vertical sides and a flat top. It differs from tabular icebergs in that its aspect ratio, the ratio between its width and height, is small, more like that of a block than a flat sheet.
In order to complete this earthcache, you must take a picture of an iceberg with you or your geonick in the picture with a part of Brown Bluff and identify the type of iceberg that it is. You must also include the size class. For example, the picture below is a medium pinnacle iceberg.
The picture below is a very large blocky iceberg.
Please go ahead and log AFTER you include the picture and required information on your submission. If we need to contact you, we will. Otherwise, assume that no news is good news, and your log and pictures are acceptable.
Reference…….Wikipedia