The Chronologic order of formation: Earth’s interior
Earth’s complex, dynamic structure is made up of multiple layers. It is crucial to understand the chronology of how these layers were formed in order to comprehend the history of planet evolution. The Earth’s oldest layer is its inner core. It was formed around 4.5 billion years ago. This core, which is mostly composed of iron and nickel, is thought to be around 5,000 to 7,500 degrees Celsius. Below the inner core there is the outer core. This is comprised primarily of iron and nickel and has a temperature around 3,000-4,000 degrees Celsius. (Lubin 2019, 2019). It is estimated that this layer is approximately 4.2 million years old. Further up, you will find the mantle which is the interior layer between the crust and outer core. The temperature in this layer ranges from 1,000 to 3,000 Celsius. It’s composed of iron and magnesium with silicon.