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.
1 Flash (pinball), a 1979 Williams pinball game designed by Steve Ritchie. 2  The Flash (video game), a 1991 action video game. 3  Teen patti or Flash, a three-card poker-style game, popular in South Asia. 4  Flash, a speed class in the Wipeout video game series.  Flash (novel), a 2004 science fiction novel by L. E. Modesitt.