How does subduction change the ocean floor?
a) subduction causes magma to accumulate on the ocean floor
b) subduction causes oceanic crust to break into pieces
c) subduction causes the ocean floor to sink into deep ocean trenches
d) subduction causes metamorphic rocks to form

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.