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pyrosphere

noun py·ro·sphere \ -ˌsfi(ə)r \

Definition of pyrosphere

1 : the hot central portion of the earth
2 : a hypothetical spherical zone of molten magma that is held to intervene between the crust of the earth and a solid nucleus and to supply lava to volcanoes

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Origin and Etymology of pyrosphere

International Scientific Vocabulary pyr- + sphere

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