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.
War (card game) War is a card game typically involving two players. It uses a standard French playing card deck. The value of each card in decreasing order is: A K Q J T 9 8 7 6 5 4 3 2. Due to its simplicity, it is played most often by children.