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Earth cutaway from core to exosphere. Partially to scale. Travelling to the Earth's center is a popular theme in science fiction. Some subterranean fiction involves traveling to the Earth's center and finding either a hollow Earth or Earth's molten core. Planetary scientist David J. Stevenson suggested sending a probe to the core as a thought ...
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius. [1] [2] There are no samples of the core accessible for direct measurement, as there are for Earth's mantle. [3]
The temperature increases towards the center of the Earth, and the higher temperature of the fluid lower down makes it buoyant. This buoyancy is enhanced by chemical separation: As the core cools, some of the molten iron solidifies and is plated to the inner core. In the process, lighter elements are left behind in the fluid, making it lighter.
In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years. [19] [20] He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value.
The internal structure of Earth. Earth's mantle is a layer of silicate rock between the crust and the outer core.It has a mass of 4.01 × 10 24 kg (8.84 × 10 24 lb) and makes up 67% of the mass of Earth. [1]
Septerra Core: Legacy of the Creator is a role-playing video game developed by Valkyrie Studios and published by Monolith Productions. It was originally released in 1999 for Windows ; since then, it has been re-released via GOG.com for Windows in 2009, for OS X in 2013, and for Linux in 2017.
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Molten Core (May 2007) – Includes ten epic bosses, from Lucifron to Ragnaros the Firelord. Magtheridon's Lair (January 2008) – Contains the Pit Lord Magtheridon, his shadow channelers, and the cubes required to interact with him. Black Temple (September 2008) – Based around Illidan Stormrage. Contains a 10 hero raid set with heroes such ...