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valley
A long narrow depression in the Earth's surface, usually formed by glacier or river erosion and fracture. Young valleys are narrow, steep-sided and V-shaped; mature valleys are broader, with gentler slopes. Some, rift valleys, and the result of collapse between faults. Hanging valleys, of glacial origin, are side valleys whose floor is considerably higher than that of the main valley.
Related category
• GEOLOGY AND PLANETARY SCIENCE
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