Chemistry Topic Practice
Earth's Early Atmosphere | GCSE Chemistry Practice
Billions of years ago, Earth's atmosphere was dominated by volcanic activity.
How did the oceans form on Earth?
What is Earth's Early Atmosphere | Practice?
"The gases that surrounded the Earth shortly after its formation."
Question 1
What was the main gas in Earth's early atmosphere?
Question 2
Which process significantly reduced CO2 levels in the early atmosphere?
Question 3
How did the oceans form?
Early vs Modern Atmosphere
Early: Mainly CO2, some Nitrogen, Water Vapor, and Ammonia.
CO2 decreased as it dissolved in oceans and was used by plants.
Oxygen increased as plants began photosynthesis.
Exam Tip
Exam Fact: Nitrogen now makes up about 78% of the atmosphere.
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