英语听力：自然百科 冰冻星球 前往地球尽头—6

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Journeying the south across the Arctic Ocean, the first land you/ reach is Greenland, the largest island in the world. Despite its name, Greenland is mostly white, covered by a giant ice sheet, six times the size of the United Kingdom.

 

In the middle of the island, the ice is nearly two miles thick. It's a bleak², quiet world. Sapphire-blue melt lakes are the first sign that a dynamic process is underway. Each lake forms in a matter of days, expanding until it's miles across and starts to overflow³

 

The spill water then carves its way/ through the ice. The water crosses through an icy delta⁴ like blood along the arteries⁵ of a cold bloody⁶ monster, a monster that is stirring.

 

And without warning, the water suddenly plunges⁷ down an open shaft⁸, falling a vertical⁹ mile into the heart of the ice sheet.

 

This melt water has a surprising effect. It lubricates the junction¹⁰ between the ice and the rock floor beneath, so the entire ice sheet is now on the move, sliding downhill into the ocean.

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