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Earth's second layer.
The second layer of eath is Mantle and it is about 1000 degrees celcius, and it was formed about 4.54 billion years ago.It is magma and if you are thinking "isn't magma the same as lava?" lava is extrusive and magma is intrusive.
http://crack.seismo.unr.edu/ftp/pub/louie/class/100/interior.html