The movement of the tectonic plates is caused by a) convection currents in earth's mantle. b) the gravity of the iron-nickel core. c) the rotation of the earth. d) the moho discontinuity. 3) which of these pieces of evidence did not in the development of the theory of plate tectonics? a) the outlines of the different continents look like they could fit together like puzzle pieces. b) similar fossil evidence has been found on continents separated by great distances. c) most earthquakes and volcanoes occur along distinct lines around the world. d) no mountains in the world are increasing in size. 4) in some areas of the world, like california and japan, earthquakes are a common occurrence. how can this best be explained? a) the strong ocean currents are undermining both areas causing earthquakes. b) both areas are subjected to strong ocean wind and waves that causes earthquakes. c) both areas are located near the edge of the pacific ocean, the unstable sand causes earthquakes. d) both areas are on the boundary of active plate margins, the motion of the plates causes earthquakes.