Educational worksheet showing the water, carbon, and nitrogen cycles with numbered parts to be completed using the correct terms and colors.

Let's solve this step-by-step by identifying the correct process for each numbered arrow in the diagrams and then determining the corresponding color to use for coloring.

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1. The Water Cycle (Top Diagram)

We analyze the arrows:

- 1: Arrows going from water body (lake/sea) into the air → This is evaporation.
- ✔ Answer: Evaporation – Yellow

- 2: Arrow from trees into the air → Water released by plants → Transpiration
- ✔ Answer: Transpiration – Pink

- 3: Arrow from cloud to cloud → Change of water vapor to liquid droplets → Condensation
- ✔ Answer: Condensation – Red

- 4: Rain falling from cloud → Precipitation
- ✔ Answer: Precipitation – Light Blue

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2. Carbon Cycle (Middle Diagram)

- 5: Three arrows pointing upward from:
- Plants (respiration)
- Animals (respiration)
- Water (diffusion)
→ All release CO₂ → Respiration
- ✔ Answer: Respiration – Dark Blue

- 6: Arrow from plant matter to plant → Plant taking in CO₂ → Photosynthesis
- ✔ Answer: Photosynthesis – Orange

- 7: Arrow from fossil fuel deposit to factory → Burning fossil fuels → Fossil Fuels
- ✔ Answer: Fossil Fuels – Dark Green

- 8: Arrow from waste to soil → Decomposition of organic matter → Decomposition
- ✔ Answer: Decomposition – Purple

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3. Nitrogen Cycle (Bottom Diagram)

- 9: Lightning striking atmosphere → Converts atmospheric nitrogen to usable forms → Lightning fixation
- ✔ Answer: Lightning fixation – Dark Blue

- 10: Dead matter → Ammonia → Decomposition
- ✔ Answer: Decomposition – Red

- 11: Ammonia → Nitrates → Nitrates (this is nitrification, but the label says "nitrates" as a result)
- ✔ Answer: Nitrates – Light Green

- 12: Waste from animals → Waste
- ✔ Answer: Waste – Dark Green

- 13: Clouds → Atmospheric nitrogen → Nitrogen cycle (general term)
- ✔ Answer: Nitrogen cycle – Pink

- 14: Plants releasing oxygen → This is part of Oxygen cycle, not nitrogen
- But wait — the arrow goes from plants to atmosphere, showing O₂ being released via photosynthesis → This is Oxygen cycle
- ✔ Answer: Oxygen cycle – Red

Wait — let’s double-check:

- 14 is an arrow from plants upward → Oxygen release → Oxygen cycle
- So it should be: Oxygen cycle – Red

But note: In the table, 14 has two options:
- Left: Atmospheric nitrogen – Light Blue
- Right: Atmospheric oxygen – Yellow

Ah! Here's a key point: 14 is labeled as “plant consumption” and shows gas rising from plants → That’s oxygen release during photosynthesis.

So:
- ✔ Atmospheric oxygen – Yellow

But wait — the option says “Atmospheric oxygen – Yellow”, so that must be it.

But earlier I thought it was “Oxygen cycle – Red”. Let’s clarify:

Looking at the table:
- 14:
- Left: Atmospheric nitrogen – Light Blue
- Right: Atmospheric oxygen – Yellow

The arrow from plants to atmosphere represents oxygen being released into the atmosphere → So it's atmospheric oxygen.

Thus:
- ✔ Atmospheric oxygen – Yellow

Now, what about 13? It's the cloud with lightning → Lightning fixation (which we already used for 9), but here it's labeled 13.

Wait — no. 13 is the cloud above the animal and plant → But there's a lightning bolt → So 13 is the lightning fixation process?

But 9 is the lightning bolt → So 9 = lightning fixation.

But 13 is the cloud, which is just atmospheric nitrogen.

Let’s re-analyze:

- 13: Arrow from cloud downward → But no arrow shown from cloud to ground? Wait — 9 is the lightning bolt → So 9 is lightning fixation.

And 13 is the cloud itself → likely representing atmospheric nitrogen.

But in the diagram, 13 is a cloud with a lightning bolt inside → so it’s involved in lightning fixation.

But the arrow labeled 9 is the lightning bolt → so 9 is lightning fixation.

Yes.

So:
- 9: Lightning fixation → Dark Blue

Then 13: What is it? The cloud → it's atmospheric nitrogen → but the label says “13” on the cloud.

In the table:
- 13:
- Left: Nitrogen cycle – Pink
- Right: Oxygen cycle – Red

But the cloud is not oxygen — it’s nitrogen-related.

So perhaps 13 is nitrogen cycle?

But the nitrogen cycle involves conversion of nitrogen gas to usable forms.

But the cloud is atmospheric nitrogen, which is part of the nitrogen cycle.

So:
- ✔ 13: Nitrogen cycle – Pink

Similarly, 14 is the upward arrow from plants → oxygen release → atmospheric oxygen → so:
- ✔ 14: Atmospheric oxygen – Yellow

But wait — the table has:
- 14:
- Left: Atmospheric nitrogen – Light Blue
- Right: Atmospheric oxygen – Yellow

So yes, 14 → Atmospheric oxygen – Yellow

But earlier I said 13 is Nitrogen cycle – Pink

But let’s check 11 and 12 again.

- 11: Arrow from ammonia to nitrates → this is nitrification, but the label says “nitrates” → so the product is nitrates
- So answer: Nitrates – Light Green

- 12: Waste from animals → Waste – Dark Green

- 10: Dead matter → ammonia → Decomposition – Red

- 9: Lightning → Lightning fixation – Dark Blue

- 13: Cloud → atmospheric nitrogen → Nitrogen cycle – Pink

- 14: Plants releasing oxygen → Atmospheric oxygen – Yellow

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Final Answers Table:

| Number | Process / Term | Color |
|--------|----------------------------|--------------|
| 1 | Evaporation | Yellow |
| 2 | Transpiration | Pink |
| 3 | Condensation | Red |
| 4 | Precipitation | Light Blue |
| 5 | Respiration | Dark Blue |
| 6 | Photosynthesis | Orange |
| 7 | Fossil Fuels | Dark Green |
| 8 | Decomposition | Purple |
| 9 | Lightning fixation | Dark Blue |
| 10 | Decomposition | Red |
| 11 | Nitrates | Light Green |
| 12 | Waste | Dark Green |
| 13 | Nitrogen cycle | Pink |
| 14 | Atmospheric oxygen | Yellow |

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Step-by-step Explanation:

1. Water Cycle:
- 1: Water evaporates from surface → Evaporation (Yellow)
- 2: Trees release water vapor → Transpiration (Pink)
- 3: Vapor condenses into clouds → Condensation (Red)
- 4: Rain falls → Precipitation (Light Blue)

2. Carbon Cycle:
- 5: Living organisms release CO₂ → Respiration (Dark Blue)
- 6: Plants absorb CO₂ → Photosynthesis (Orange)
- 7: Fossil fuels burned → Fossil Fuels (Dark Green)
- 8: Decay of waste → Decomposition (Purple)

3. Nitrogen Cycle:
- 9: Lightning converts N₂ → Lightning fixation (Dark Blue)
- 10: Dead matter → ammonia → Decomposition (Red)
- 11: Ammonia → nitrates → Nitrates (Light Green)
- 12: Animal waste → Waste (Dark Green)
- 13: Clouds represent nitrogen in atmosphere → Nitrogen cycle (Pink)
- 14: Plants release O₂ → Atmospheric oxygen (Yellow)

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Summary of Answers:

| # | Answer | Color |
|---|----------------------------|--------------|
| 1 | Evaporation | Yellow |
| 2 | Transpiration | Pink |
| 3 | Condensation | Red |
| 4 | Precipitation | Light Blue |
| 5 | Respiration | Dark Blue |
| 6 | Photosynthesis | Orange |
| 7 | Fossil Fuels | Dark Green |
| 8 | Decomposition | Purple |
| 9 | Lightning fixation | Dark Blue |
|10 | Decomposition | Red |
|11 | Nitrates | Light Green |
|12 | Waste | Dark Green |
|13 | Nitrogen cycle | Pink |
|14 | Atmospheric oxygen | Yellow |

✔ Now you can use these answers to color the diagram accordingly.

Let me know if you'd like a printable version or a colored sketch!