Icebergs:The word 'iceberg' probably comes from the Norwegian word 'isberg', which means 'ice mountain'. Every year abut 10000 - 15000 icebergs forms around the world. Although modern ships know where icebergs are now, in the past, icebergs ____ one of the biggest dangers in the sea. The famous Titanic ____ when it hit an iceberg in 1912 and many people ____. Because of this accident, thirteen countries ____ the International Ice Patrol in 1914. The organisation ____ information to ships about icebergs ever since. Biologists ____ icebergs for a long time to find out how they change sea life. When an iceberg melts, nutrients go into the sea. Recently, scientists ____ that the water near icebergs is full of plankton fish and other sea life. Scientists ____ the way icebergs fall to pieces when they are in warmer waters. One of the biggest icebergs ____ off from the Ross Ice Shelf in Antartica in 2000. It was 295km long and 37km wide.

Present Perfect Simple and Continuous (Form 3 Unit 3 - English Close-Up)

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