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 Flash Player. 1  Delivering on the Promise of eLearning âAdobe Systems, Inc.  Adobe Flash Player is software used to stream and view video, audio and multimedia and Rich Internet Applications (RIA) on a computer or supported mobile device. Flash Player was originally created by Macromedia, but is now developed and distributed by Adobe Systems Inc. Download this free guide.