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.
The agents of erosion are gravity, ice, water, and wind. Erosion is sometimes restricted to transportation, excluding weathering.So as rock is eroded away by one force or another, the landscape changes. If enough sediment is eroded away in one place, it can begin to form erosional landforms.