features of valleys and mountains

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Across
  1. 4. eroded inter-locking spur
  2. 6. a knife edged ridge
  3. 7. a valley carved out by a glacier
  4. 9. a long narrow lake
  5. 10. a tributary glacial trough perched up on a side of a main valley
Down
  1. 1. fragments of angular rocks
  2. 2. a sharp edged mountain peak
  3. 3. a high ridge running across the valley
  4. 5. a deep depression in the side of a mountain
  5. 8. the lake at the bottom of a corrie