[Answer] What caused Niagara Falls to stop flowing for 30 hours in 1848?

Step 1 : Introduction to the question "What caused Niagara Falls to stop flowing for 30 hours in 1848?"

...1. Ice stopped the flow of water
2. It was dammed upstream by beavers
3. The water source that feeds it dried up
4. Rockfall upstream blocked the flow

Step 2 : Answer to the question "What caused Niagara Falls to stop flowing for 30 hours in 1848?"

Ice stopped the flow of water:

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