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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.
