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.
Shadow zone: Areas on the surface of the Earth where no P-waves or S-waves from a particular earthquake are received. Shadow zones are caused by the refraction (bending) of waves as they pass through the different layers of the Earth.The shadow zones for each earthquake depend on its location.Helpful rule: If no P or S waves-the reason is a shadow zone. If P-waves but no S-waves-the reason is S-waves were blocked by the outer core of the Earth.he shadow zones for each earthquake depend on its location. Helpful rule: If no P or S waves-the reason is a shadow zone. If P-waves but no S-waves-the reason is S-waves were blocked by the outer core of the Earth.