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.
Full Definition of VIDEO CARD. : a circuit board in a computer system designed to generate output for the system's video display screen.See video card defined for English-language learners.ADVERTISEMENT.ideo card. noun. Tweet. computers: a device in a computer system that controls the images that are shown on the computer's screen.