12 marks
Complete the following sentence:
The atmosphere is primarily composed of two gases: approximately 78% is __________ and 21% is __________.
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Syllabus Edition
First teaching 2024
First exams 2026
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Introduction to the Atmosphere (DP IB Environmental Systems & Societies (ESS): SL): Exam Questions
7 mins4 questions
21 mark
Outline one natural (non-human) input to atmospheric systems.
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31 mark
State the atmospheric layer in which most clouds form.
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43 marks
List three greenhouse gases.
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