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The crust/mantle/outer core/inner core is extremely thick.
The interior structure of the Earth, similar to the outer, is layered. These layers can be defined by either their chemical or their rheological properties. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.
Originally posted by ChaoticOrder
Water doesn't make up a huge percentage of the Earth.
Originally posted by NightFlight
How large would a sphere of crude oil be? Could all the crude deposits be calculated? That would be an interesting ball to see.