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.
Ages 8-18. By Lawrence E. Shapiro, Ph.D. This hilarious card game is designed to help children understand the different reactions we have to difficult situations and how our responses affect those around us.ges 8-18. By Lawrence E. Shapiro, Ph.D. This hilarious card game is designed to help children understand the different reactions we have to difficult situations and how our responses affect those around us.