Answer 1:
The thinnest layer of the solid earth is the crust. The Earth has these layers: atmosphere ~ 50-100 km thick, hydrosphere, 5 km depth average crust thickness ; in continents 35 km granite rock, in oceans about 7 km gabbro rock mantle, 2800 km =peridotite rock core, metal=3000 km thick iron alloy (some Ni, S) liquid outer core, solid inner core.
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