What is the time period and frequency of a sound wave if it completes 500 vibrations in 50 seconds

The diagram shows the layers of earth. convection currents in which region influence the movement of tectonic plates

What in scientific term why the salty popcorn causes this thirst

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?