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Why Does The St Johns River Flow North Joke?

The St. Johns River flows north, but it isn’t the only river in Florida that flows backward. The Peace River and its tributaries are also flowing south, which is unusual for rivers in the United States.

The reason for this odd phenomenon is that Florida’s groundwater comes from rainwater that fell on the Appalachian Mountains thousands of years ago. This water flows down through Florida’s aquifer, which is filled with sand and clay particles. These particles eventually become compacted together into rock-like formations such as limestone and dolomite.

As this rock forms, it traps hydrogen sulfide beneath it. This hydrogen sulfide reacts with oxygen from the air to form sulfuric acid — which dissolves limestone and dolomite into calcium sulfate (gypsum).

The calcium sulfate then dissolves in rainwater as it passes through cracks in the rock below ground, forming an acid solution that can dissolve even more rock! This process continues until all of the limestone or dolomite has been dissolved away and nothing is left but pure freshwater — which then flows back up toward the surface along cracks in rocks above ground!

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Last modified: November 7, 2022

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