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.
1 The area under attack is eroded using the major processes of coastal erosion. 2  Points of weakness, such as faults and joints are attacked most, and eventually a wave-cut notch is gouged out. 3  The rock above overhangs the notch, and as it is cut deeper into the rock, gravity causes the overhanging rock to collapse. Cliffs are formed when destructive waves attack the bottom of the rock face between high and low water mark. 2  The area under attack is eroded using the major processes of coastal erosion. 3  Points of weakness, such as faults and joints are attacked most, and eventually a wave-cut notch is gouged out.