The story
Introduced by John Wesley Powell in 1875.
Etymology from Wiktionary, CC BY-SA 4.0.
base level
Today it means: The lower limit for the vertical position of an erosion process. Full definition →
Today it means: The lower limit for the vertical position of an erosion process. Full definition →
Introduced by John Wesley Powell in 1875.
Etymology from Wiktionary, CC BY-SA 4.0.