a stream is most likely widen by erosion
Most likely a fast moving stream.
calcite
The mouth of the river is where light penetration is most likely the lowest
All streams meander to some extent. The most likely time is when flow is consistent and gradient is uniform. See Braided Stream. When a stream has eroded the steep valleys to genteler slopes, the stream flows more slowly.Now water in the stream erodes along the sides of the stream bed rather than along the stream bottom. === ===
Most likely, dehydration
conglomerate
use of organic fertilizers (manure) in farming
conglomerate
Placer deposits.
The slope or gradient of the stream is the most likely factor to affect the amount of erosion. Steeper slopes result in higher velocities, which in turn increase the erosive power of the stream. A steeper slope also allows the stream to carry larger sediment and potentially cause more erosion.
Altitude sickness most likely
wind