Why is the Nile river unusual?

It's unusual because it is one of the few major rivers that flow from south to north.

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how deep is the indian ocean

The Indian Ocean's average depth is 12,990 feet (3,960 metres)

The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface.It is bounded by Asia—including India, after which the ocean is named on the north, on the west by Africa, on the east by Australia, and on the south by the Southern Ocean. 

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