What pattern is the second step of this reaction? 
Definitions:
Broad Valley
A wide and often flat trough between mountains or hills, typically having a river or stream running along it.
Braided Stream
A stream or river with an interconnecting network of branching and reuniting shallow channels.
Constant Flow
A steady, uniform rate of movement or supply.
Meander Scars
Erosional features left in the landscape by the remnants of ancient river meanders.
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