Wind is the agent of erosion that creates sand dunes. The wind blows grains of sand into a sheltered or otherwise secure location, allowing gradual accumulation.Know More
Each dune features a windward face and a slip face. The windward face is the area where the sand is blowing and pushing materials upward. The slip face is the side that does not experience wind. Dunes that are formed underwater experience a similar phenomenon but through currents of water instead.
Sand dunes are classified by shape. Crescentric dunes are crescent-shaped, while linear dunes are mostly straight. Star dunes occur when wind from many different directions blows sand. Dome dunes are circular, lacking a slip face. Parabolic dunes are formed by wind that blows outward from their center.Learn more about Erosion & Weathering
"Wave erosion" occurs when the energy and pressure of waves combines with the chemical composition of water to erode rock and sand. Wave erosion is also known as coastal erosion and occurs not only in oceans, but also in other large bodies of water.Full Answer >
Waves cause erosion by moving sand and debris during storms and other events, as they break higher than normal on the beach, pulling sand back into the water with them. Human interventions and major weather events such as tropical storms and hurricanes erode beaches in this way.Full Answer >
Wind and water erosion are least likely to affect igneous sills and cooled lava flows. Limestone, basalt and quartzite are also unlikely to undergo erosion or weathering, as are sandstone and chert. Soil and soft rocks such as clays erode very quickly without protection.Full Answer >
The Schools of the Pacific Rainfall and Climate Experiment notes that coastal erosion occurs due to wave and current activity, storms, earthquakes, wind, tides and the shifting of tectonic plates. Coastal erosion is a mostly natural process; however, man-made structures such as piers and harbors can contribute to erosion due to restructuring of the natural environment.Full Answer >