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Which of the following statements about the Earth is true?

A The mantle makes up the largest percentage of the Earth’s volume
The mantle is the largest segment of the Earth’s structure, and takes up the most space by volume. The crust is interestingly not the only solid part of Earth, the inner core is also solid, and is believed to be made up of a mixture of iron and nickel.
B The interior of the Earth is not molten
C The crust is the only part of the earth that is solid
D The average temperature of the Earth’s core is 200 °C