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Actually the fastest flowing river in the world is one that no one would ever suspect. I claim the Passiac River at Paterson NJ is hands down the fastest flowing river in the world during flood stage.
The Great Falls of the Passaic River at Paterson NJ falls 77 ft into an extreme narrow gorge which at the head of the gorge the river channel is no more than 25-30 ft wide. It is at this point in the falls into which the greatest volume of river water plummets. At flood stage when there is many billions of gallons per day going over the falls, the combination of the velocity of the descending water crushing down onto the channel squeezes or puts pressure onto the water in the channel from above. This combined with a very narrow cross section causes the velocity in that short and small section of the river to easily flow some 70 mph. There is nothing like it anywhere in the country maybe the world. This is not a man made channel, it is natural, so the flow velocity during floods is the fastest naturally occurring flow (if you can call it flow, it literally shoots laterally out of the narrow section of gorge)
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The World Glacier Monitoring Service reported that the fast-moving Jakobshavn Glacier in Greenland holds the record for the fastest moving glacier. It can move up to 150 feet per day.
The world's fastest moving glaciers are found in Greenland and Antarctica. The Jakobshavn Glacier in Greenland is one of the fastest moving glaciers, reaching speeds of up to 150 feet per day. In Antarctica, glaciers like the Lambert Glacier have been recorded to move at speeds exceeding 16 feet per day.
The center or axis of a glacier generally moves the fastest when the glacier is moving by internal plastic flow. This is due to the greater pressure and thickness of ice at the center, causing it to flow more readily than the slower moving edges and margins of the glacier.
The central part of the glacier moves fastest than its edges as it is thickest from the center.
Depending on when it was formed, the size and speed it is moving it could be either an Avalanche or Glacier. If it is an incredibly old, slow moving, large, ice mass it is likely a Glacier; however if it is a quickly moving, small (relatively), ice mass it is an Avalanche.
When a glacier stops moving and end moraine will be deposited in front of it.