Earth's core is definitely the hottest part of our planet. It is made up of metals entirely. The core consists of two layers which are known as Outer core and Inner core. The outer core is mostly made of iron and nickel. The outer core is approximately 2300 km in thickness. The iron and nickel forms an alloy which is very hot at temperature 4000 to 5000°C. The Inner core is approximately 1200 km in thickness.
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http://www.wonderwhizkids.com/index.php/planet-earth
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http://www.wonderwhizkids.com/index.php/planet-earth
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