The slowest and smallest acting methods of destroying surface features is Convergence.
Erosion is the washing away of earth surface features by agent of erosion
such as wind and water. This process are not really slow it destruction can be
massive (gully erosion) and it's consequences are fast.
Flooding is an overflowing of water onto dry lands. This process is fast and
can be really large.
Volcanic activity or volcanic eruption are not as fast as the other 2
process but they are not that slow and it devastation can be really large.
Convergence simply implies the converging nature of the lithospheric plate
of the earth. This is one of the slowest process that takes place in the earth. It
might take thousand or millions of years to see it effect but the effect can be
large.
Therefore, the answer is convergence.
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