1. Lesson 3: Carbon Cycle

2. Lesson Objectives To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

3. Carbon 1.What processes produce carbon dioxide? 2.What processes use carbon dioxide? 3.Where else can we find carbon dioxide? Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

4. Carbon Cycle Production of Carbon Dioxide: – Respiration – Carbon dioxide released in respiration. – Combustion – Burning fossil fuels (oil, gas and coal) releases carbon dioxide. Where carbon dioxide is used: - Photosynthesis – Carbon dioxide used by plants. Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

5. Carbon Cycle Where else is it found: -Dissolved in the oceans. -In our atmosphere (only very small amount though). -In dead remains (shells, bones) -In rocks (carbonates) Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

6. Carbon Cycle Plants and Oceans – contain most of the Earth’s carbon dioxide – they are called Carbon dioxide “sinks”. Carbon dioxide is returned when dead remains are decomposed or combusted. Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

7. Carbon Cycle Burning fuels: Propane + Oxygen  C 3 H + 5O 2  3CO 2 + 4H 2 O Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

8. Carbon Cycle Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

9. Carbon Cycle 1.Draw a labelled diagram to show how boiling a kettle contributes to the rising carbon dioxide levels. 2.Explain why the amount of carbon dioxide in the Earth’s atmosphere has risen in the last 50 years. 3.Complete exam-style questions on page 108. Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers, To know why things decay To know why decay is such an important process To know what happens in the carbon cycle

10. Review Objectives I still feel unsure. I need some more help to understand. I feel ok. I need to do some more work to check my understanding. I am happy and feel I understand and can explain the main points. To know why things decay To know why decay is such an important process To know what happens in the carbon cycle Keywords: Decomposers, Detritus feeders, compost, decay, carbon cycle, energy transfers,