Which of the following best describes how erosion by groundwater might create a landform ? ? a. slightly acidic water dissolves serbian rocks underground to form a cavern b. a stream flowing through a plain gradually wears away the rock and soil to form valley c. waves crashing against a rocky shoreline cause parts of the cliff to break away and produce a sea cave d. river water slows down as it approaches the ocean and deposits sediment that builds up form a delta