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.
Evolution of the flash memory card. Earlier removable storage media, such as the PC card, smart card and similar cards used for computer gaming systems, are also considered memory cards. However, the newer types of memory cards are smaller, require less power, have higher storage capacities and are portable among a greater number of devices.