Question detail
What were the possible early atmospheric gases on Earth?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
What were the possible early atmospheric gases on Earth?
Answer
The possible early atmospheric gases on Earth included methane and ammonia. These gases were likely present due to volcanic activity and other geological processes.
Explanation
A strong answer should directly address the approved learning objective to describe possible early atmospheric gases including methane and ammonia. 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 ammonia, and keeps the wording specific to AQA GCSE revision.
Common mistake
Confusing Early Gases
Students often confuse methane and ammonia as being the same gas when describing possible early atmospheric gases.
Remember that methane (CH₄) is a hydrocarbon, while ammonia (NH₃) is a nitrogen compound. Make sure to distinguish between their chemical formulas and properties.
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