Examlex
When a 4-year-old child has an erection, we can most likely assume:
Base Level
The lowest point to which a river or stream can erode its channel, often sea level for rivers.
Uplift
The vertical elevation of the Earth's surface due to natural causes such as tectonic movements or volcanic activity.
Terraces
Flat, step-like surfaces on a sloped piece of land, created either by natural processes like river erosion and glacial activity or by human agricultural practices.
Active Channel
The portion of a river or stream that is currently used for the flow of water, often subject to frequent changes in course and volume.
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