An iceberg is an enormous piece of ice floating in the sea. 'BERG' is the German word for mountain. In the coldest parts of the earth, around the North and South Poles, land and sea are both covered by sheets of ice, over 300 meters deep at the center.
Tongues of ice, called glaciers, stretch out into the open waters of the occeans. The sea water melts the bottom part of these glaciers, then the top part slides into the water with a mighty roar. The great piece of ice sinks for a short time beneath the surface then it rises again, and floats aways as a new iceberg. Some iceberg are miles across to begin with, and travel for thousands of miles and several years before they is only about one ninthy of the total size. The rest is hidden beneath the waves.
One of the world's worts disasters at the sea was in 1912 when the liner Titanic colided with an iceberg on her miden voyage.
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