Explain the significance of the gases released by volcanoes in relation to the Earth's early atmosphere.

The gases released by volcanoes, including carbon dioxide, water vapour, and nitrogen, were crucial in forming the early atmosphere, which lacked oxygen. These gases contributed to the greenhouse effect and the eventual formation of oceans as the Earth cooled.

A strong answer should directly address the approved learning objective to recall that volcanoes released carbon dioxide, water vapour and nitrogen. This question belongs to The Earth's early atmosphere within The composition and evolution of the Earth's atmosphere, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to carbon dioxide, and keeps the wording specific to AQA GCSE revision.