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