Huge Waves Destroying Arctic Ice Faster than Expected

Ice covers much of the Arctic Ocean.Some pieces of ice are huge，like moving islands.As temperatures have increased ，however，some of the ice has begun to disappear.Scientists have discovered huge waves in the arctic waters.

The waves were discovered by accident in May，2010.Scientist Aleksey Marchenko and his students set out on a trip.They wanted to study the icy waters.

The ship travelled east and stopped next to a large block of ice around 50 miles from the small island of Hopen.Marchenko prepared to lead his students out onto the ice.

"We were ready to go but when I went out，I discovered many cracks around，" he remembers.

He decided to move the ship deeper into the ice to keep safe.The farther in they went，he thought，the harder the ice would become.As they pushed forward，however，the ship experienced small waves，and then bigger ones.Soon，the waves broke up the ice around the ship into thousands of smaller pieces.

Within an hour，Marchenko and his team saw a wave that was about 13 feet high.The ship's navigation system finally recorded the largest waves.They were more than 20 feet in height.The waves were so strong that they forced huge pieces of ice to jump up and down，breaking the ice into smaller pieces within just one hour.Scientists had never imagined that the process could happen so fast.The waves in these areas used to be small.

The speed and force of the huge waves there makes it impossible to know in advance when they are coming.That could be dangerous for navigators and local communities who are unprepared for huge waved or depend on sea ice to protect them.Wildlife like polar bears that depend on sea ice to live is also in danger.

Some scientists think people will soon see even bigger waves in icy waters.As waves break up ice ，seas will be more open，waves will be stronger.There are stormy times ahead.

根据短文内容，请用完整句子回答下列问题。

（1）When did Marchenko and his students discover huge waves in the arctic waters？

                                                              　

（2）What happened to the ice around the ship when the ship moved into the ice？

（3）How high were the largest waves recorded by the navigation system？

　                                                              　

（4）What animals will be in danger because of the huge waves？

　                                                              　

（5）What will people see in these icy waters？

　                                                             　

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