A PIECE OF NEWS 3 : Mammoth-killing comet questioned

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I took this picture from BBC News web site on Thuersday 29nd, January, 2009. This is a picture of Mammoth. It’s in prehistoric time. The animals in the picture are walking and looking. They are calm because there isn't danger.

As you can see, there is a big animal with lage tusk and cloudy landscape. I like it because the picture it is must be remembered prehistoric animals.

PIECE OF NEWS SUMMARY:

A study of wildfires after the last ice age has cast doubt on the theory that a giant comet impact wiped out woolly mammoths and prehistoric humans.

However, the results showed increased fires after periods of climate change.

The cometary impact hypothesis holds that an enormous comet slammed into or exploded over North America in the Younger Dryas period some 12,900 years ago.
The idea was first mooted by Richard Firestone of Lawrence Berkeley Laboratory in the US and colleagues in 2007.
The impact, they argue, would have unleashed a shock wave and ignited fires spanning the entire continent. That in turn would explain a number of other observations.

The lack of vegetation would also have contributed to the extinction of the "megafauna" - large animals such as woolly mammoths and mastodons - that disappear from the fossil record around that time.
But the theory has inspired a degree of scepticism in the palaeontology community, and many suggest that much more data is needed to prove or refute it.