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.
What is the shadow zone and why is it important in seismic studies? Figure 1: Cross section of the Earth's interior. Cream color is the inner core, yellow the outer core and orange the mantle. Black lines represent the pathways of seismic waves travelling through the Earth from an epicenter at 0Â°. Note how the waves are refracted as they travel through the liquid outer core, creating the P-wave shadow zone.