Gap Fill - Paragraph One


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   biological      frozen      ground      high      infectious      microbes      millennia      result      scientists      something   

Paragraph 1

Scientists say there could be under frozen that contains many deadly diseases. Ancient have been trapped for in the permafrost that covers large areas of Earth. Permafrost is ground that stays completely for at least two years. It is common in mountains and near the North and South Poles. The scientists say the permafrost is melting because of climate change. The could be the release of unknown, harmful viruses, which are calling 'Factor X'. Birgitta Evengard, a professor in diseases at a university in Sweden, said we know little about Factor X and the dangers trapped in Earth's permafrost.

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