________ consist(s)of large boulders placed at the base of slopes.

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Riprap consists of large boulders placed at the base of slopes to prevent erosion from water flow. Rock dams are structures built across water channels to retain water or create storage reservoirs. Rock sheds are structures built to protect roads, railways, etc. from rockfalls or avalanches. Retaining walls are structures built to hold back soil to create a level surface for planting or construction.

________ Consist(s)of Large Boulders Placed at the Base of Slopes