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.
Wave cut platforms. The sea cliff is the most widespread landform of coastal erosion. Cliffs begin to form when destructive waves attack the bottom of the rock face between the high and low water marks. By the wave processes such as hydraulic power and abrasion, the waves undercut the face forming a wave-cut notch.ave cut platforms. The sea cliff is the most widespread landform of coastal erosion. Cliffs begin to form when destructive waves attack the bottom of the rock face between the high and low water marks. By the wave processes such as hydraulic power and abrasion, the waves undercut the face forming a wave-cut notch.