1
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The course of the river.

2
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The upper course is where the river starts and you can find the source.

3
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The source is the place where the river starts.

4
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The rain forms small streams.

5
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This erodes the land and makes V-shaped valleys and here the waterfalls.

6
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This is a tributary. The tributary is a small river that connects with other bigger rivers.

7
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The middle course joins the river and the flow increases.

8
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The lower course is the part of the river that the river ends.

9
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You can find it in the lower corner of the mouth.

10
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Bye!