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.
(card games) In some games, a point awarded to the player whose cards add up to the largest sum. (countable) The equipment that enables such activity, particularly as packaged under a title. Some of the games in the closet we have on the computer as well. One's manner, style, or performance in playing a game.