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GCSE Combined Science · key term
The mixture of gases surrounding the Earth.
Used by AQA and Edexcel
Specification 5.9.1.1, 5.9.1.2, 5.9.1.3 · Paper 4
Revise: Atmospheric Gas ProportionsThe atmosphere is the mixture of gases surrounding the Earth. The air we breathe is part of this atmosphere: it is not a single gas and it is not all oxygen.
The mixture of gases surrounding a planet.
The layer of gases surrounding the Earth.
Specification Earth and atmospheric science · Paper 3, Paper 4
Revise: The formation and evolution of Earth's atmosphereThe atmosphere is the mixture of gases surrounding the Earth. It has not always had the composition we breathe today. During the Earth’s early history, intense volcanic activity released gases from its interior.
Describe the early atmosphere as mainly carbon dioxide with little or no oxygen, not as having today’s gas proportions.
When interpreting evidence about the early atmosphere, explain what the observation supports rather than claiming it proves the exact composition.
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