<u>Downcutting of a stream may be due to the uplift of land.</u>
Further explanation:
Downcutting: It is referred to as a downward erosion, erosional downcutting or vertical erosion. It is a process in which the hydraulic action removes the material from the bed of the stream or the floor of the valley and deepens the channel of a valley or stream. The downcutting speed depends upon the lowest point up to which the stream can be eroded or stream base level. The maximum level the stream can be eroded is the sea level but few streams have higher base level because they join or fall into another water body that is above sea level or meets the bedrock that can resists erosion. The lateral erosion is responsible for widening the valley or stream channel. When the stream is above its base, the rate of downcutting is more than lateral erosion but as the stream reaches its base, the lateral erosion is faster than downcutting
<span>Downcutting (also known as rejuvenation) of a stream may be due to the uplift of land. It is a process by the action of the hydraulic that makes the channel of the valley or stream by simply get rid of any material on the floor of valleys and streams. Downcutting speed is determined by the base level of the stream. It is the lowermost point that a valley or streams can lose.</span>
