1. Narrow rills => long wide gullies => deepening & widening => valley2. Associated with youthful stage3. Result from vertical erosion4. Gorge is a deep valley with straight sides; equal width @ top & bottom; form in hard rocks5. Canyon is a deep valley with steep slopes; wider @ top; form in sedimentary rocks

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1. 1. Narrow rills => long wide gullies => deepening & widening => valley
2. Associated with youthful stage
3. Result from vertical erosion
4. Gorge is a deep valley with straight sides; equal width @ top & bottom; form in hard rocks
5. Canyon is a deep valley with steep slopes; wider @ top; form in sedimentary rocks