Weathering and Eroding

• (n.) The action of the elements on a rock in altering its color, texture or composition or in rounding off its edges.
• (p.pr.&vb.n.) of Weather.

noun

• Geology) the mechanical process of wearing or grinding something down (as by particles washing over it. ()
  • synonyms: erosion, eating away, wearing, wearing away

verb

• Become ground down or deteriorate.
  • usage: "Her confidence eroded"
  • synonyms: erode, gnaw, gnaw at, eat at, wear away
• Remove soil or rock.
  • usage: "Rain eroded the terraces"
  • synonyms: erode, eat away, fret