Why the 1) ........ empire of the ancient Egyptian pharaohs collapsed into economic ruin, remains one of history's many unsolved mysteries. But recent 2) ........ have suggested that the answer may lie underneath Lake Tana in the Ethiopian highlands. Lake Tana supplies the water which makes the Nile Valley so fertile. Samples of sediment taken from the lake show that the lake may have 3) ........ dried up around 4,200 years ago due to climate change. As the Egyptian economy depended on 4) ........ , this is all that it would have taken to destroy it. In fact, it would have caused a 5) ........ famine lasting for two hundred years. There are many other theories, however, about the pharaohs' demise, including 6) ........ from Asia and civil war.

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