Question: Which of the following is not a sign that precedes a major earthquake? Question options: distortions of land surface near active faults. volcanic eruption occurs before earthquakes. cracks in rocks release radon gas into the air. foreshocks or small quakes that precede a major one. microscopic cracks develop as the rock approaches rapture point.Which of the following plate movements is likely to result in the formation of a rift valley? Question options: divergent plate boundaries. convergent plate boundaries. ocean-ocean plate movements. transform plate boundaries. zone of subduction.