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warm, call,
light, but, danger, above, sink, land, towards,
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Not many people have seen icebergs. Sailors(船员) sometimes see them but they 51 to keep away from them. We call the top and bottom of the world the South and North Poles(南北极). Here there is ice over the sea and the 52 . The ice is often thousands of meters thick. The ice often moves slowly down 53 the sea. Then big pieces of ice break off and float(漂浮) on the sea. We 54 these big pieces of ice “icebergs ”.
Most of an iceberg is under the water. Ice is only a little 55 than water. The top of an iceberg may not be near 56 a ship, 57 the ship hits the iceberg below the water.Then the ship 58 .Sometimes the water becomes 59 . The bottom of the iceberg becomes smaller and smaller. Then it turns right over. Sometimes it hits a ship. Icebergs are often very beautiful but they are also 60 .