Basically, a passive radiator is a reactionary device as the name suggests. When a driver (such as a subwoofer) is mounted to a sealed speaker box (enclosure), the physical forward/back movement of the speaker affects the internal air pressure of the enclosure.
The 3 landforms created by wave erosion sometimes called coastal  erosion are headlands and bays, cliffs and wave cut platforms and  finally caves, arches, stacks and stumps â¦ . Wave erosion is the  wearing away of land and the removal of beach by wave currents.
Coastal Landforms (Features of Erosion). Land forms on the coast are created or formed as a result of wave processes such as corrasion/abrasion, hydraulic, solution and attrition. These processes erode the coast and the material is transported and deposited along the coastline.