This table compares magnitude and depth of four earthquakes occurring between 1955 - 2017. the surface changes that occur as a result of earthquakes begin in earth's crust. what conclusion can be drawn about earthquake activity within earth's crust based on the data shown?
a) earthquake depth has continuously increased throughout the past century.
b) higher-magnitude earthquakes do not always happen deeper in earth's crust.
c) the higher an earthquake's magnitude, the deeper in earth's crust it occurs.
d) earthquake magnitude has continuously decreased throughout the past century.