In one mole, there are 6.022 x 10 23 atoms. Here's another way: there are 6.022 x 10 23 atoms of carbon in 12 grams of carbon-12. Let's say that real clearly: one mole of ANYTHING contains 6.022 x 10 23 entities. The word entities is simply a generic word.
Shadow zone. A seismic shadow zone is an area of the Earth's surface where seismographs cannot detect an earthquake after its seismic waves have passed through the Earth. When an earthquake occurs, seismic waves radiate out spherically from the earthquake's focus.
Freebase(0.00 / 0 votes)Rate this definition: Transition zone. The transition zone is part of the Earthâs mantle, and is located between the lower mantle and the upper mantle, between a depth of 410 and 660 km. The Earthâs mantle, including the transition zone, consists primarily of peridotite, an ultramafic igneous rock.