River Systems diagram illustrating the flow from source to mouth, including key features like tributaries, floodplain, and meanders.

Let’s go step by step to answer each question using the river system diagram.

We’re looking at a cross-section of a river system with labeled parts (A through J). We need to match each letter to the correct feature based on standard river geography terms.

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1. Which letter indicates the young stream in the system?

Young streams are usually found in high elevations, steep slopes, and often near the headwaters — where the river starts. In diagrams like this, that’s typically at the top or back of the landscape shown. Looking at the diagram, letter A is at the highest point, likely the source area — so it’s the young stream.

→ Answer: A

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2. Which letter indicates a mature river in the system?

Mature rivers have wider valleys, more meandering, and are farther downstream than young streams but not yet at the mouth. They’re in the middle stage. In the diagram, letter C looks like it’s in the middle section — flowing through a broader valley, not too steep, not flat yet.

→ Answer: C

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3. Which letter indicates an old river in the system?

Old rivers are very wide, slow-moving, almost flat, and close to sea level. They often form floodplains and oxbow lakes. In the diagram, letter E is near the bottom, wide and flat — that’s the old river stage.

→ Answer: E

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4. Which letter indicates the mouth of the river?

The mouth is where the river ends — usually emptying into a lake, ocean, or another body of water. In the diagram, letter F is at the very end, where the river meets the larger body of water (probably the ocean or a lake).

→ Answer: F

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5. What does letter B indicate?

Letter B is pointing to a small tributary joining the main river. Tributaries are smaller streams that feed into bigger rivers. So B = tributary.

→ Answer: Tributary

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6. What does letter D indicate?

Letter D is pointing to a curved bend in the river — that’s called a meander. Meanders are typical in mature and old rivers.

→ Answer: Meander

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7. What does letter G indicate?

Letter G is pointing to the land between two bends of the river — that’s called a point bar if it’s on the inside of the bend (where sediment builds up), or sometimes just “floodplain” if it’s the flat area. But since it’s right next to the curve and looks like deposited material, it’s likely a point bar.

Wait — let’s double-check. In many diagrams, G might be pointing to the oxbow lake if it’s cut off… but here, looking again — actually, G seems to be pointing to the cut bank (the outer edge of the meander where erosion happens) OR possibly the floodplain. Hmm.

Actually, re-examining common labeling:

In standard river diagrams:
- Cut bank = outer bend (erosion)
- Point bar = inner bend (deposition)
- Oxbow lake = abandoned meander

Looking at position: If G is on the outside of the bend → cut bank. If inside → point bar.

But without seeing exact arrow direction, we rely on typical textbook labels. Often, G is used for oxbow lake if it’s separated. Wait — in your diagram description, there’s a note: “an oxbow lake forms when a meander gets cut off.” And letter H is probably the oxbow lake.

Let me reassess based on logic:

If D is the meander bend, then:
- Outer side = cut bank
- Inner side = point bar
- Separated loop = oxbow lake

Assuming G is pointing to the landform adjacent to the meander — likely point bar (if inner) or cut bank (if outer). But since the question says “what does letter G indicate”, and in many such diagrams, G is the point bar, I’ll go with that.

Actually — wait! Let’s look at question 8: “What does letter H indicate?” — that’s likely the oxbow lake.

So if H is oxbow lake, then G is probably the point bar.

→ Answer: Point bar

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8. What does letter H indicate?

As above — if it’s a U-shaped body of water disconnected from the main river, that’s an oxbow lake. Formed when a meander gets cut off.

→ Answer: Oxbow lake

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9. What does letter I indicate?

Letter I is pointing to the flat area around the river — especially near the old river section. That’s the floodplain — the land that gets flooded during high water.

→ Answer: Floodplain

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10. What does letter J indicate?

Letter J is pointing to the entire drainage basin — the area of land that drains into this river system. It’s outlined as the whole region feeding the river.

→ Answer: Drainage basin (or watershed)

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Now, let’s compile all answers clearly.

Final Answer:
1. A
2. C
3. E
4. F
5. Tributary
6. Meander
7. Point bar
8. Oxbow lake
9. Floodplain
10. Drainage basin