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A story holds that she was tired when she created "the rich and the noble", so all others, or "cord-made people", were created from her "dragg[ing] a string through mud". [ 6 ] In the Huainanzi , there is a description of a great battle between deities that broke the pillars supporting Heaven and caused great devastation.
Aluminium (or aluminum) metal is very rare in native form, and the process to refine it from ores is complex, so for most of human history it was unknown. However, the compound alum has been known since the 5th century BCE and was used extensively by the ancients for dyeing .
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth itself.
Earth's crust is its thick outer shell of rock, referring to less than one percent of the planet's radius and volume. It is the top component of the lithosphere , a solidified division of Earth 's layers that includes the crust and the upper part of the mantle . [ 1 ]
Earth's outer core is a fluid layer about 2,260 km (1,400 mi) thick, composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. [ 1 ] [ 2 ] [ 3 ] The outer core begins approximately 2,889 km (1,795 mi) beneath Earth's surface is at the core-mantle boundary and ends 5,150 km (3,200 mi) beneath Earth's ...
By the Warring States Period at the end of the Zhou (3rd century BC), the Chinese explained the Earth's axial tilt, the northwestern direction of celestial bodies, and the southeastern tendency of major Chinese rivers through a legend about a great water god or monster named Gonggong who damaged Mount Buzhou after losing a battle for leadership ...
The liquid aluminium sinks to the bottom of the solution and is tapped off, and usually cast into large blocks called aluminium billets for further processing. [46] Anodes of the electrolysis cell are made of carbon—the most resistant material against fluoride corrosion—and either bake at the process or are prebaked.
The iron catastrophe is a postulated major geological event early in the history of Earth, where heavy metals such as iron and nickel congregated in the core during a geologically brief period. The original accretion of the Earth 's material into a spherical mass is thought to have resulted in a relatively uniform composition.