Examlex
The 1920 census revealed that more Americans lived in rural, rather than urban, areas.
Base Level
The lowest point to which a river can erode its channel, often sea level for rivers that flow directly into the oceans, but can be a lake or resistant rock layer for other rivers.
Mouth
The part of a river where it flows into another body of water, such as a lake, sea, or ocean.
Tectonics
The study of the structure and movement of the Earth's crust and its large-scale processes such as earthquakes, mountain building, and plate movements.
Sea Level
The average level of the ocean's surface, used as a standard in measuring land elevation and ocean depth.
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