Explain the following observation: "Icebergs floating in sea are dangerous for ships".

Explanation

**Step-by-Step Solution:**

1. **Understanding Icebergs**: Icebergs are large masses of ice that have broken off from glaciers and are floating in the sea. They are primarily composed of freshwater ice.

2. **Density Comparison**: Ice has a lower density than seawater, which is why icebergs float. The density of ice is about 0.92 g/cm³, while the density of seawater is approximately 1.03 g/cm³. This difference in density allows icebergs to float.

3. **Submersion of Icebergs**: According to Archimedes' principle, a floating object displaces a volume of fluid equal to its own weight. For icebergs, this means that a significant portion of their mass is submerged. Typically, about 90% (or 9/11) of an iceberg is underwater, while only about 10% (or 2/11) is visible above the surface.

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