about one-fifth (approximately 20%) oxygen proportions of various other gases, including carbon dioxide, water vapour and noble gases. 4.9.1.2 Theories about what was in No knowledge of other 1 Extended writing: describe Video clips the Earth’s early theories is required. the theory of the evolution atmosphere, and how the of the Earth’s early YouTube: atmosphere was formed, appropriate atmosphere. have changed and information, interpret developed over time. evidence and evaluate Extended writing: explain Evidence for the early different theories about why the composition of atmosphere is limited the Earth’s early the atmosphere has YouTube: because of the time scale of atmosphere. changed over billions of 4.6 billion years. years. about ancient WS 1.1, 1.2, 1.3, 3.5, Compare the Earth’s volcanoes, climate One theory suggests that 3.6, 4.1 atmosphere to that of etc: during the first billion years Mars and Venus. of the Earth’s existence there was intense volcanic activity that released gases that formed the early atmosphere and water vapour that condensed to form the oceans. At the start of this period the Earth’s atmosphere may have been like the atmospheres of Mars and Venus today,
about one-fifth (approximately 20%) oxygen proportions of various other gases, including carbon dioxide, water vapour and noble gases. 4.9.1.2 Theories about what was in the Earth’s early atmosphere, and how the atmosphere was formed, have changed and developed over time. Evidence for the early atmosphere is limited because of the time scale of 4.6 billion years. One theory suggests that during the first billion years of the Earth’s existence there was intense volcanic activity that released gases that formed the early atmosphere and water vapour that condensed to form the oceans. At the start of this period the Earth’s atmosphere may have been like the atmospheres of Mars and Venus today, No knowledge of other theories is required. appropriate information, interpret evidence and evaluate different theories about the Earth’s early atmosphere. WS 1.1, 1.2, 1.3, 3.5, 3.6, 4.1 1 Extended writing: describe the theory of the evolution of the Earth’s early atmosphere. Extended writing: explain why the composition of the atmosphere has changed over billions of years. Compare the Earth’s atmosphere to that of Mars and Venus. Video clips YouTube: YouTube: about ancient volcanoes, climate etc:
AQA-8462-SOW-ATMOS.DOCX