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Where did the gases of Earth's early atmosphere come from?
A
Nitrogen: 78%; oxygen: 21%.
B
Photosynthesis removed carbon dioxide and released oxygen into the atmosphere.
C
They came from volcanic eruptions releasing gases from inside Earth.
D
Nitrogen and oxygen together make up about 99% of today's atmosphere.
Card 1 of 24
9.2 Earth and atmospheric science Flashcards
24 flashcards on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science: the key terms, definitions and equations you need to recall for Paper 1 and Paper 2.