Carbon Cycle

• Carbon is essential for all living organisms.

• It moves through both living and non-living parts of Earth.

• The carbon cycle enables life on Earth.

Photosynthesis

• Plants and algae convert CO₂ and H₂O into glucose (C₆H₁₂O₆) and O₂ using sunlight.

• Equation: CO₂ + H₂O + Sunlight → C₆H₁₂O₆ + O₂

• Captures carbon from the atmosphere.

​Respiration

​Respiration

• Living organisms release energy from glucose, producing CO₂ and H₂O.

• Equation: C₆H₁₂O₆ + O₂ →CO₂ + H₂O + Energy

• Adds CO₂ back into the atmosphere.

​Decomposition

​Decomposition

• Decomposers like bacteria and fungi break down dead organisms and waste.

• Releases CO₂ into the atmosphere

​Combustion

• Burning of organic materials like wood, fossil fuels.

• Equation: CxHy + O₂ → CO₂ + H₂O + Energy (Heat and Light)

• Increases atmospheric CO2, contributing to global warming.

​Geological Carbon Cycle

• Formation:

  • Organic carbon turns into limestone or fossil fuels over millions of years.

• Earth’s Role:

  • Plate tectonics release this stored carbon via volcanic activity.

Geological Carbon Cycle

• fossil fuels formation .

Oceans' Role in Carbon Cycle

• Absorption:

  • Oceans absorb CO₂ from the atmosphere.

  • Carbon settles in the form of shells at the ocean bottom.

• Impact:

  • Dissolved CO₂ forms acids, which harm shellfish.

Label the process of carbon cycle

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Poster(individually)
1. Read the instruction
2. Highlight the key words(What to draw and what to label)
3. Make a poster on your notebook.