what is the longest bridge in the world

The Danyang–Kunshan Grand Bridge is the world's longest bridge. It is a 164.8-kilometre bridge

The bridge is located on the rail line between Shanghai and Nanjing in East China’s Jiangsu province

what is the longest animal in the world?

The Lineus Longissimus is one of the longest known animals, with specimens up to 55 metres) long 

They may grow as long as 55 metres), which would make it the longest animal in the world. The body is brown with lighter (longitudinal) stripes. Its mucus contains a relatively strong neurotoxin which it uses as a defence against predators. 

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.