16 



of the streams usually flow gently and ^Yithout sudden falls; oiily 

 in a few piaces small waterfalls occur over a cliff which rises 

 abruptly out of the sea, as at Bosdalafos on Vaago, \Yhere the 

 outlet from the large lake Sorvaagsuatn falls into the sea from a 



Fig. 10. Stromo. Ravine (Gjov) near Veslmanhaim. Showing the luxuriant plant-vegetation (Angelica, etc) 



to the right. In the niiddle the stream falls down over a close succession of rockj' boiilciers. 



(After a photograph bj- Warming). 



height of 15 — 20 metres. On the other hånd, consequently, as the 

 upper courses of the streams traverse sloping rock-surfaces, they 

 flow more rapidly, their erosive action forming furrows, clefts and 

 ravines in the channels (Fig. 10). 



Lak es. The numerous lakelets which occur in the valleys 

 have different forms corresponding to the form of the latter; in 



