Answer: erodible

AnswerCrossword Clue
ERODIBLENot rustproof
ERODIBLECapable of being eaten away
ERODIBLESubject to slow disintegration
ERODIBLELike loose soil
ERODIBLELike beaches
ERODIBLESusceptible to losing ground
erodiblecapable of being eroded, also EROSIBLE