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The structure of the Earth comprises of the crust, mantle, outer core and inner core. The crust and upper part of the mantle are broken into tectonic plates. Read through this GCSE Chemistry revision guide to explore detailed explanations and diagrams of the structure of the earth and plate tectonics.

The composition of the atmosphere has changed since the Earth was formed 4.5 billion years ago. Natural processes and human activity have changed the atmosphere, and continue to change it today.