How do gradient, discharge, channel size, and channel roughness ...

[nautica902]

How do gradient, discharge, channel size, and channel roughness typically change from the head to the mouth of a stream?
 
  What will be an ideal response?

Question 2

List two ways in which streams erode their channels.
 
  What will be an ideal response?

[ndhahbi]

Answer to Question 1

From the headwaters to mouth, there is usually an increase in discharge and channel size. Gradient decreases, as does channel roughness (due to a decrease in sediment particle size). In order to accommodate the growing discharge, channel size increases downstream as well, and so does flow velocity (despite decreasing gradient).

Answer to Question 2

Sufficiently strong water flow can dislodge particles from the channel and lift them into the moving water. A stream can also erode bedrock with by the particles it carries, acting as abrasives or drills into the streambed.

[nautica902]

TYSM

[smrtceo]

Gracias!