During the Archean eon, the cooling of the Earth led to the condensation of water vapour, forming the early oceans. This transition initiated a significant decline in the concentration of atmospheric carbon dioxide (CO2\text{CO}_2CO2).
Describe the physical and chemical processes by which the newly formed hydrosphere sequestered this atmospheric carbon dioxide into the geosphere.
97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.