Discussion
The middle zone of the earth with a thickness of 2780 km having an average density of 5.6 is known as:
Answer: C
This zone is the pyrosphere.
Also called the mantle, it lies between the crust and the core, is about 2,880 km thick, and has an average density around 5.6. It is solid rock but deforms plastically over long periods, and its slow convection drives the movement of the plates above it.
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