ICSE Class 9 Answered

As we know that density of ice (0.917 gcm^-3) is less than the density of water ( 1 gcm^-3 ), therefore huge masses of ice known as iceberg are able to float in water with its 11/12th part submerged inside the fresh water and 25/28th part submerged  in sea water. So, when sailors see an iceberg, they see only a very small part (approx. 10%) of it. Therefore, the collision with these icebergs may be dangerous.