9. These are smaller rivers that flow into larger rivers, they are called __

## Step 1<br />The problem is asking for the term used to describe smaller rivers that flow into larger rivers. This is a geographical term that is used to describe the relationship between different types of water bodies.<br />## Step 2<br />The term we are looking for is used to describe smaller rivers that flow into larger rivers. These smaller rivers are known as tributaries.<br />## Step 3<br />Tributaries are smaller rivers that flow into larger rivers. They contribute to the flow of the larger river, hence the term "tributary".