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: 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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