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 Freecell-One of the worlds most popular card games. 2  Pyramid-Matching card game where the player attempts to pair cards with a total value of 13. 3  Golf-Discarding card game, where you remove as many cards as you can from play.rick Taking Card Games. In all trick taking card games, each hand is centered around a series of rounds which are called tricks. In most of these card games, the goal is to win as many tricks as possible. There are some exceptions to this, such as in hearts where the goal is to win as few tricks as you can.