* Glacier creep is a slow but powerful form of erosion where glaciers move and carve out land.

* Landslides are rapid movements of soil and rock downhill, not a slow process.

* Weathering is the gradual breakdown of rocks, soil, and minerals through processes like freezing/thawing, chemical reactions, and biological activity. This happens very slowly over long periods.

Therefore, weathering is the slowest type of erosion mentioned.