Riprap - Stones or other material placed on a slope to prevent erosion by water action.
Riser - The vertical member from the top of one stair tread to the top of the one next above.
Lockport dolostone riprap along the Niagara River in Black Rock
Definitions:
Lockport: city about 15 miles northeast of Buffalo
dolostone: a magnesium-rich sedimentary rock resembling limestone; a white or light-colored material ...
 See also: House, Architecture, Trim, Valley, Foundation
  
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