Duelling Chemists

About this topic

Revise Earth and Atmosphere, including choosing which gas is most abundant in Earth's atmosphere today, roughly what percentage of Earth's atmosphere is oxygen, choosing which gas is a major greenhouse gas and explaining how do greenhouse gases warm Earth.

This topic covers

• choosing which gas is most abundant in Earth's atmosphere today
• roughly what percentage of Earth's atmosphere is oxygen
• choosing which gas is a major greenhouse gas
• explaining how do greenhouse gases warm Earth

Example question types

• answer a short question such as “Which gas is most abundant in Earth's atmosphere today”
• answer a short question such as “Roughly what percentage of Earth's atmosphere is oxygen”
• answer a short question such as “Which gas is a major greenhouse gas”