1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:
Q1: What is a river basin?
Q2: What is a tributary?
[Answer]

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The journey of a river

We are going to begin a journey, following a river as it flows from its source in the hills to its mouth at the sea.

The water that flows from a spring in the hills makes a stream.

Streams join together to make a river. The river is joined by more branches, or tributaries.

The river basin is the land drained by all of these channels.