To measure the strength of an earthquake, you can use either a Richter scale or Mercalli scale. Richter scale uses the amplitued of the wave and the distance from the source. Mercalli scale uses observations of people and is not considered to be scientific as Richter scale.
Ball 4 because the higher the elevation is the greater the potential energy it has
True because when the light bounces off a surface it creates a rainbow which we call roygbiv
