Earth’s atmosphere and resources
Learn Earth’s atmosphere and resources for Year 9 pupils (ages 13–14). Free practice questions, lessons and worked examples — aligned to the UK National Curriculum.
What you'll learn
- 1
Earth’s early atmosphere was mostly carbon dioxide with little oxygen. Today it is about 78% nitrogen and 21% oxygen.
- 2
As Earth cooled, water vapour condensed into oceans, and much carbon dioxide dissolved into them — later locked into sedimentary rocks and fossil fuels.
- 3
What produced most of Earth’s oxygen?
- 4
Why is burning fossil fuels significant for the atmosphere?
- 5
Apply it: early Earth's atmosphere was mostly carbon dioxide with no oxygen. Photosynthesis by early algae released oxygen over billions of years, and CO₂ became locked into oceans, rocks and fossil fuels.
- 6
What produced the oxygen in Earth's atmosphere?
- 7
Why does burning fossil fuels raise atmospheric CO₂?
Practise Earth’s atmosphere and resources with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 13–14. Aligned to the UK National Curriculum.