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12:39 Chapter 13 Part VI Chapter 13 Part VI	Chapter 13 Part VI reaction step rate steps oxygen catalyst nitrogen mechanism law intermediate molecules dioxide reactants mechanisms energy activation converter phase barrier things From Arianna Demmerly 6 plays 0
14:04 Arctic & Earth SIGNs – Causes of… Arctic & Earth SIGNs – Causes of Climate Change	Arctic & Earth SIGNs – Causes of Climate Change non metals climate carbon emissions ghg emissions carbon dioxide air pollution infrared radiation weather captionnewentrcomplete glaciers scientists climate change planet earth astronomy temperature (weather) greenhouse effect From Sean Holland 88 plays 0