Sailing near an iceberg

The two photos showed how small the cruiser, Clipper Adventurer, was when it was compared with an ice-berg.

Next, let us study the information supplied by Wikipedia about icebergs:

An iceberg is a large piece of freshwater ice that has broken off from a snow-formed glacier or ice shelf and is floating in open water. It may subsequently become frozen into pack ice or come to rest on the seabed in shallower water, causing ice scour.

Because the density of pure ice is about 920 kg/m³, and that of sea water about 1025 kg/m³, typically only one-tenth of the volume of an iceberg is above water. The shape of the under water portion can be difficult to judge by looking at the portion above the surface. This has led to the expression "tip of the iceberg", generally applied to a problem or difficulty, meaning that the visible trouble is only a small manifestation of a larger problem.

Icebergs generally range from 1 to 75 meters (3–250 ft) above sea level and weigh 100,000 to 200 000 tons. The tallest known iceberg in the North Atlantic was 168 meters (550 ft) above sea level, making it the height of a 55-story building. Despite their size, the icebergs of Newfoundland move an average of 17 kilometers a day (10 mi).[3] These icebergs originate from the glaciers of western Greenland, and may have an interior temperature of -15 to -20°C (5 to -4 °F).

Though usually confined by winds and currents to move close to the coast, the largest icebergs recorded are calved, or broken off from, the Ross Ice Shelf of Antarctica. Iceberg B-15, photographed by satellite in 2000, measured 295 km long and 37 km wide (183-23 mi), with a surface area of 11,000 km² (4,250 mi²). The mass was estimated around three billion tonnes.
When an iceberg melts, it makes a fizzing sound called "Bergie Seltzer." This sound is made when compressed air bubbles trapped in the iceberg pop. The bubbles come from air trapped in snow layers that later become glacial ice.

Ice campers who camp on top of flat or hollowed icebergs are known as icebergers.

Names for various sizes of iceberg are not universal, but usually follow a similar pattern. The size classification in the table below is used by the International Ice Patrol:

Size Category Height Length
Growler Less than 1 meters (3 ft) Less than 5 meters (16 ft)
Bergy Bit 1–5 meters (3–16 ft) 5–15 meters(16–50 ft)
Small 5–15 meters(16–50 ft) 15–60 meters(50–200 ft)
Medium 15–45 meters(50–150 ft) 60–120 meters(200–400 ft)
Large 45–75 meters(150–250 ft) 120–200 meters(400–660 ft)
Very Large Over 75 meters(250 ft) Over 200 meters(660 ft)

In addition to the above size classification, there is also a type of classification based on shape. 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.

Non-tabular icebergs have different shapes, and include,
[1] Dome: An iceberg with a rounded top.
[2] Pinnacle: An iceberg with one or more spires.
[3] Wedge: An iceberg with a steep edge on one side and a slope on the opposite side.
[4] Dry-Dock: An iceberg that has eroded to form a slot or channel.
[5] Blocky: An iceberg with steep, vertical sides and a flat top. It differs from tabular icebergs in that its shape is more like a block than a flat sheet.