Identify the words in the text that correspond to the French words below. Note that some of the answers may include more than one word.
Scientists have completed drilling through the central Greenland ice cap, obtaining an ice core that records climate data for the past 120,000 years. They reached bedrock at 8:15 a.m. on 17 July after seven years, and 3,000 metres, of drilling in one of the most remote spots on Earth.
Air bubbles in the core will tell them how the climate has changed over the entire period -- right through the last major ice age. And frozen water beneath the ice cap may contain microbes that have been isolated from the outside world for hundreds of thousands of years.
The North Greenland Ice-Core Project (NGRIP) was carried out in the middle of the Greenland ice sheet, on a high plateau of stable ice. Before the project begun, sub-surface radar observations made from airplanes indicated that it would be an ideal place to drill a hole through the sheet.
The goal was to recover ice that was frozen 120,000 years ago, from before the last major ice age, when the world was warmer than it is today. There are important questions to be answered about the global climate over the intervening period. For example: What happened before the beginning of the last ice age? Was the start of the cold period sudden or gradual?
Two other ice cores drilled elsewhere in Greenland have not given clear answers about how the last ice age started. One suggested that the transition was gradual, but the other indicated that it was sudden, and was preceded by large, rapid variations in climate.
Warm periods between ice ages typically last about 10,000 years. As it has been about 12,000 years since the end of the last glacial period, it is important to be able to identify the signs of an approaching ice age. This explains why the third core provided by the NGRIP project was needed.