Epirogenic movements are called... When you're plates move vertically, or... of top down and bottom up... that is, go up and down... The only easy example that I can think of is that of a floor of mosaic loose mud, where to tread on them you do some sinking and return to raise when you raise the foot climb again. In the case of the Earth, movements are caused by the instability of the Magma, gravity, and other astronomical and geological factors
