英语听力：自然百科 澳大利亚大堡礁 Great Barrier Reef—11

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But when it was active, the peak of this volcano was 6, 000 feet high. Millions of years of wind and weather have worn it down. A hundred miles north are the Glass House Mountains, all that's left of the interior of another huge volcano.

 

To understand how the Great Barrier Reef began, they'll need samples from both mountain peaks. But this one's around 1, 500 feet tall. Not the easiest place to get to.

 

“Kind of stuck. Riser's stuck.”

 

“ohh.”

 

With the wing under control, the quest can begin.

 

“This is the mission here. Glass House Mountains.”

 

Time has eroded¹ this volcano beyond recognition. All that remains² is the central core of lava³ that once lived within the volcano. It has cooled to form this sheer pinnacle⁴ of rock. Riddled⁵ with cracks, it has left handholds.

 

Kurt is now on the less eroded slopes of Mount Warning--slopes built from dust and ash from ancient eruptions⁶. But that's not what he needs. He's looking for a sample of pristine⁷ lava.

 

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