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| valley | |||
| valley Any low-lying land bordered by higher ground; especially an elongate, relatively large, gently sloping depression of the Earth's surface, commonly situated between two mountains or between ranges of hills or mountains, and often containing a stream with an outlet. It is usually developed by stream erosion, but may be formed by faulting | |||
| dal: 9 phrases in 4 subjects |
| Communications | 3 |
| Earth sciences | 2 |
| Electronics | 1 |
| Life sciences | 3 |