aqa a-level geography case studies tectonics climate module climate change climate final overview mount st helens history of the theory wegener intrusive igneous tectonic boundaries tsunami management stromboli volcanic management volcanic hazards tsunami volcanoes case study monsoons uk storm 1987 storm uk case study climate change responses kyoto pollutants summer and winter smog london and mexico air quailty photochemical smogs coriolis explained atmospheric ciruclation altidudinal pressure gradient factors causing variation in insolation global heat budget structure of the atmosphere urban heat islands air quality low pressure systems tropical cyclones hurricane hurricane formation geography climate change evidence
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