Answer:
Here is the diagram with the streams labeled.
[Image of a diagram with streams labeled 1, 2, 3, and
The stream order is a measure of the relative size of a stream. The smallest streams are called first-order streams, and the largest streams are called fourth-order streams. The order of a stream is determined by the number of tributaries that it has. A first-order stream has no tributaries, a second-order stream has one or two tributaries, a third-order stream has three or four tributaries, and a fourth-order stream has five or more tributaries.
In the diagram, the first-order streams are the smallest streams, and the fourth-order streams are the largest streams. The first-order streams are located at the headwaters of the watershed, and the fourth-order streams are located at the mouth of the watershed.
