GCSE Chemistry – Evolution of the Atmosphere | How the Atmosphere Changed Over Time (2026/27 exams)

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*** WHAT’S COVERED ***
1. The Earth’s Early Atmosphere
* The role of intense volcanic activity in releasing gases.
* Composition of the early atmosphere, which was mostly carbon dioxide.
2. How the Atmosphere Began to Change
* Condensation of water vapour to form the oceans.
* The dissolving of carbon dioxide from the atmosphere into the oceans.
3. The Role of Photosynthesis
* The evolution of algae and green plants.
* How photosynthesis decreased atmospheric carbon dioxide and increased oxygen levels.
4. The Locking Away of Carbon
* How dead marine organisms formed sedimentary rocks like limestone.
* The formation of fossil fuels such as crude oil, natural gas, and coal from the remains of plants and plankton.

*** CHAPTERS ***
0:00 Introduction to the Evolution of the Atmosphere
1:02 The Early Atmosphere & Volcanic Activity
1:50 The Role of Algae and Plants
2:37 Formation of Sedimentary Rocks & Fossil Fuels
3:43 Recap

*** PLAYLISTS ***

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