. Elementary physical geography . , forming but onestage in river development. They are speedily removed, andany lake which exists in the course of a stream, acts as a bar-rier to river development so long as it remains. The removalof lakes is usually accomplished by the combination of twoprocesses of river work : one, the filling of the lake, the other,the cutting of the barrier. Lake-filling is by far the mostimportant, and neaily every particle of sediment that come?into the lake waters, works towards this end of destruction. DELTAS, FLOODPLAINS, WATERFALLS, ETC. 301 Unless the conditions a
. Elementary physical geography . , forming but onestage in river development. They are speedily removed, andany lake which exists in the course of a stream, acts as a bar-rier to river development so long as it remains. The removalof lakes is usually accomplished by the combination of twoprocesses of river work : one, the filling of the lake, the other,the cutting of the barrier. Lake-filling is by far the mostimportant, and neaily every particle of sediment that come?into the lake waters, works towards this end of destruction. DELTAS, FLOODPLAINS, WATERFALLS, ETC. 301 Unless the conditions are exceptional, the process ofdown-cutting at the outlet of the lake is relatively unim-portant. For streams which emerge from these quiet bodiesof water have very little working power, because all sedi-ment has been removed by the lake, and the stream hasthus been robbed of the tools with which it commonly doesits work. It is still able to act chemically; but this is one ofthe least important means which streams have for cutting.
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