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.
During erosion, part of the geologic cycle, land is worn away and carried elsewhere by elements like wind and rain. Rock and tiny pieces of rock called silt are carried away to make up sediment. Sediment builds up in areas through a process called deposition. Of course, all that rock and silt has to go somewhere. Sometimes deposition is as dramatic as the creation of a new island like Surtsey, but often it affects much smaller, incremental changes in land that, over time, can become new landforms like mountains and deltas.