A new model explaining this mysterious process suggests the core was created as dribs and drabs of iron percolated inward from Earth's lower mantle, according to a study published Oct. 6 in the journal Nature Geoscience. The mantle is the viscous, rocky layer between the crust and Earth's iron core.
Definition of flash card. : a card bearing words, numbers, or pictures that is briefly displayed (as by a teacher to a class) usually as a learning aid.
Related Flashcards. Vocabulary for Modern World History 4. Find, create, and access History, World History, US History, Adolf Hitler, World War II, quot, flashcards with Course Hero. Definition: A line of trenches and fortifications in World War I that stretched without a break from Switzerland to the North Sea.