Biogeochemical Cycles Worksheets - Free Printable

Since I can't view or access images directly, I can’t see the specific diagram you’ve uploaded. However, based on the text and structure of your worksheet titled "The Carbon Cycle", I can help you solve the problems and explain the answers using general knowledge of the carbon cycle.

Let’s go through each question step by step:

---

1. Label the steps of the carbon cycle using the diagram above.

Even without seeing the image, in a typical carbon cycle diagram, the following processes are usually shown:

1. Photosynthesis – Plants absorb atmospheric CO₂ to make organic matter (glucose).
2. Respiration – Plants, animals, and decomposers release CO₂ back into the atmosphere.
3. Decomposition – Dead organisms and waste are broken down by decomposers, releasing CO₂.
4. Combustion – Burning fossil fuels or biomass releases stored carbon as CO₂.
5. Carbon storage – Carbon is stored in fossil fuels, soil, oceans, and living organisms.
6. Ocean absorption – Oceans absorb CO₂ from the atmosphere.
7. Consumption – Animals eat plants, transferring carbon through the food chain.

👉 So, if the diagram has arrows pointing from the atmosphere to plants → this is photosynthesis.
Arrows from plants/animals to atmosphere → respiration or combustion.
From dead matter to soil → decomposition.
From fossil fuels to atmosphere → combustion.

> Answer (example):
> 1. Photosynthesis
> 2. Respiration
> 3. Decomposition
> 4. Combustion
> 5. Ocean absorption
> 6. Consumption

*(Note: The exact order depends on how the arrows are labeled in your diagram.)*

---

2. During __________, plants take in carbon dioxide, and during __________, humans release carbon dioxide.

This is straightforward:

- Plants take in CO₂ during photosynthesis.
- Humans (and animals) release CO₂ during respiration.

> ✔ Answer:
> During photosynthesis, plants take in carbon dioxide, and during respiration, humans release carbon dioxide.

---

3. What role do decomposers play in the carbon cycle?

Decomposers (like bacteria and fungi) break down dead organisms and waste materials. In doing so, they release carbon stored in organic matter back into the atmosphere as CO₂ through respiration.

> ✔ Answer:
> Decomposers break down dead organisms and waste, releasing carbon dioxide back into the atmosphere through decomposition.

---

4. What impact do humans have on the carbon cycle?

Humans significantly affect the carbon cycle primarily through:
- Burning fossil fuels (coal, oil, gas) → releases large amounts of CO₂.
- Deforestation → reduces the number of trees that absorb CO₂.
- Industrial processes and land-use changes → increase atmospheric CO₂ levels.

This contributes to global warming and climate change.

> ✔ Answer:
> Humans increase the amount of carbon dioxide in the atmosphere by burning fossil fuels, deforestation, and industrial activities, which disrupts the natural balance of the carbon cycle.

---

5. Name 2 carbon sinks: ________ and ________

A carbon sink is something that absorbs more carbon than it releases.

Common examples:
- Oceans – absorb CO₂ from the atmosphere.
- Forests – trees absorb CO₂ during photosynthesis.
- Soil – stores carbon from decomposed plant matter.
- Fossil fuels – store carbon over millions of years (though not active sinks now).

> ✔ Answer:
> Oceans and forests (or soil)

---

✔ Final Answers Summary:

1. (Depends on diagram) — Likely: Photosynthesis, Respiration, Decomposition, Combustion, etc.
2. Photosynthesis, Respiration
3. Decomposers break down dead matter and release carbon dioxide into the atmosphere.
4. Humans increase atmospheric CO₂ through fossil fuel use, deforestation, and industry.
5. Oceans and forests (or soil/fossil fuels)

---

If you can describe the diagram (e.g., what the arrows point to), I can tailor the answer even more precisely!