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.
Adobe's Flash Player is one of the most popular plug-ins on many websites, developed as multi-platform software for use on all the major operating systems. This plug-in provides what is called Active Content, meaning it adds additional functionality to web pages for interactive or media-related capability.