This worksheet challenges students to correctly label the different parts of a river, from the source in the mountains down to the delta at the mouth.

Problem Description:

The task is to label the parts of a river system using the provided labels at the bottom of the page. The labels include:

- tributary
- confluence
- delta
- estuary
- floodplain
- levee
- meander
- mouth
- oxbow lake
- source
- waterfall

Solution Approach:

To solve this problem, we need to identify each part of the river system in the diagram and match it with the correct label from the list. Let's analyze the diagram step by step:

#### 1. Source:
- The source of a river is typically where the river begins, often in highlands or mountains.
- In the diagram, the topmost part shows water flowing down from a mountainous region. This is the source.

#### 2. Waterfall:
- A waterfall occurs when the river flows over a steep drop.
- In the diagram, there is a section where the river appears to be dropping sharply. This is the waterfall.

#### 3. Tributary:
- A tributary is a smaller stream or river that flows into a larger river.
- In the diagram, there are smaller streams joining the main river. These are tributaries.

#### 4. Confluence:
- A confluence is the point where two rivers join together.
- In the diagram, there is a point where two streams merge into the main river. This is the confluence.

#### 5. Meander:
- A meander is a bend or curve in the river.
- In the diagram, there is a noticeable bend in the river. This is the meander.

#### 6. Oxbow Lake:
- An oxbow lake is a U-shaped body of water formed when a meander is cut off from the main river.
- In the diagram, there is a U-shaped body of water near the meander. This is the oxbow lake.

#### 7. Floodplain:
- A floodplain is the flat land along the sides of a river that is prone to flooding.
- In the diagram, the area surrounding the river (especially near the middle and lower sections) is labeled as the floodplain.

#### 8. Levee:
- A levee is a natural or artificial embankment along the riverbank to prevent flooding.
- In the diagram, there are raised banks along the sides of the river. These are levees.

#### 9. Estuary:
- An estuary is the wide mouth of a river where it meets the sea or ocean, and freshwater mixes with saltwater.
- In the diagram, the wide opening where the river meets the sea is the estuary.

#### 10. Mouth:
- The mouth is the point where the river enters the sea or ocean.
- In the diagram, the point where the river meets the sea is the mouth.

#### 11. Delta:
- A delta is a triangular deposit of sediment at the mouth of a river.
- In the diagram, the triangular area at the mouth of the river is the delta.

Final Labeling:

Based on the analysis, the labels should be placed as follows:

- Source: Topmost part of the river.
- Waterfall: Sharp drop in the river.
- Tributary: Smaller streams joining the main river.
- Confluence: Point where two streams merge.
- Meander: Bend in the river.
- Oxbow Lake: U-shaped body of water near the meander.
- Floodplain: Flat land surrounding the river.
- Levee: Raised banks along the river.
- Estuary: Wide mouth of the river where it meets the sea.
- Mouth: Point where the river enters the sea.
- Delta: Triangular deposit at the mouth of the river.

Final Answer:

\boxed{
\begin{array}{ll}
\text{Source} & \text{Topmost part of the river} \\
\text{Waterfall} & \text{Sharp drop in the river} \\
\text{Tributary} & \text{Smaller streams joining the main river} \\
\text{Confluence} & \text{Point where two streams merge} \\
\text{Meander} & \text{Bend in the river} \\
\text{Oxbow Lake} & \text{U-shaped body of water near the meander} \\
\text{Floodplain} & \text{Flat land surrounding the river} \\
\text{Levee} & \text{Raised banks along the river} \\
\text{Estuary} & \text{Wide mouth of the river where it meets the sea} \\
\text{Mouth} & \text{Point where the river enters the sea} \\
\text{Delta} & \text{Triangular deposit at the mouth of the river} \\
\end{array}
}