The mantle is a layer between the crust and the outer core. Earth's mantle is a silicate rocky shell with an average thickness of 2,886 kilometres (1,793 mi). The mantle makes up about 84% of Earth's volume. It is predominantly solid but in geological time it behaves as a very viscous fluid.
demolition - an event (or the result of an event) that completely destroys something wipeout, destruction conclusion, ending, finish - event whose occurrence ends something; his death marked the ending of an era; when these final episodes are broadcast it will be the finish of the show
Eradicating means  to get rid of from the deep roots; or maybe kill in large numbers. I think eradicate means to get rid of, to wipe out, eliminate, extinguish etc. But according to the free dictionary it means to tear up by the roots, which I interpreted as getting rid of something by going to its primary source. So the word eradicate could be used in reference to plagues, like the plagues wiped out a whole population, wanting to eradicate hunger, etc. Check the Free Dictionary link below for more. Eradicating means to get rid of from the deep roots; or maybe kill in large numbers. I think eradicate means to get rid of, to wipe out, eliminate, extinguish etc. But according to the free dictionary it means to tear up by the roots, which I interpreted as getting rid of something by going to its primary source.