Mountains can be formed by erosion!
The Grand Canyon is a surface feature formed by water erosion. All riverbeds are formed by water erosion. Hoodoos are formed by water erosion.
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Glacial Erosion formed Yosemite Valley and the Sierra Nevada
sand dunes
cave formations and sinkholes
Gulfs are formed by erosion. Gulfs are formed by erosion.
Creep is formed by erosion.
Deltas are formed by constructive erosion.
Erosionally formed features include valleys, stream and river channels, lake beds, sand dunes, all glacially formed features such as eskers and moraines, seaside cliffs and beaches, canyons, mesas, spires, buttes, caves, and deltas, among others.
Yosemite National Park and lakes were formed by erosion in California.