This lesson has been written for GCSE students with a focus on the key processes and reactions involved in the carbon cycle as well as discussions centering around how the levels of carbon dioxide alter during the day and over longer periods of time. A number of quick competitions have been written into the lesson to introduce key terms or to challenge students to recognise key reactions that they will have already met in their Biology lessons. As each stage of the cycle is encountered, time is taken to discuss the potential impacts and the organisms involved. The remainder of the lesson looks at carbon dioxide levels. Initially, students are challenged to explain why the levels would change during the course of a day. Students are already likely to be aware that carbon dioxide levels have increased over the last 100/200 years but not necessarily how much. Time is taken to focus on the mathematical skills which could be challenged on this topic and the percentage change equation is shown to the students so they can quantify their answers. As a class, deforestation and its effect on the carbon cycle and atmospheric levels are discussed so that students can mirror this in a homework task about combustion of fossil fuels. Progress checks are written into the lesson at regular intervals so that students are constantly assessing their understanding.
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