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.
Definition of Macromedia Flash. Macromedia Flash is a multimedia platform that is used to create stand-alone and web animations and applications that are interactive. Flash content can be manipulated, using the scripting language ActionScript, in different ways and on a number of devices including mobile phones. Flash Formats.