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CH225: Describe how acid rain forms
CH226: Describe the effects of acid rain
CH227: Explain the formation of nitrous oxides
CH228: Describe the formation and composition of the Early Atmosphere
CH229: Describe the formation of the oceans
CH230: Explain how carbon dioxide levels have decreased
CH231: Explain why oxygen levels have increased
CH232: Describe the test for oxygen
CH233: Explain the greenhouse effect
CH234: Explain what a causal link is
CH235: Explain the effect of human activities on the Earth
CH236: Evaluate how to reduce climate change
