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about the size of 4 earths
They dig down and take core samples.
So far as science can deduce, it must be a solid.
Invar can be used as magnetic core material, but there are better choices. Invar is alloyed for its thermal stability. It is iron with a good percentage of nickel. Remember that magnetic core material is usually laminated or is "powdered" in a way to electrically isolate the "bits" of core material so eddy currents will be reduced. A link is posted to the article on Invar put up by our friends at Wikipedia, where knowledge is free.
The inner core of the Earth is composed of solid iron. The outer core is made up of molten metals, primarily a nickel-iron alloy.
The principle element found at the Earth's core is iron.
The mantle and core make up the most percentage of Earth's mass. The mantle is the thickest layer and accounts for about 84% of Earth's total volume, while the core makes up about 32.5% of Earth's total mass.
It can take up to 200,000 years to reach the surface
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The core of the Earth is thought to consist of roughly 80% iron.
BC, Alberta and Ontario are core to Canada's funding.
Earths made 40% of the liquid
It can take up to two months for an apple core to decompose in a landfill. Banana peels will take a few days to decompose. While glass takes a very long time to decompose, a paper bag can take up to five months.
The answer depends on the context: percentage of WHAT! For example, the Cenozoic era takes up approx 0% of the age of the universe.
22%