WHAT
IS AN ICEBERG?
An
iceberg is a great 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 layers of ice, more than 300 meters deep at
the centre.
Tongues
of ice, called glaciers, stretch out into the open sea. The sea water melts the
bottom parts of these glaciers, then, the top part moves into the water with a
great noise. The great piece of ice sinks for a short time under the surface, then,
it rises again and floats away as a new iceberg. Some icebergs are many miles
long, and travel for thousands of miles and several years before they finally
melt. The part of an iceberg which can be seen above the water is only about
one-ninth of the total size. The rest is hidden under the waves.
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