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.
large, rounded landforms developed in massive rocks such as granite by exfoliation. These are formed as a result of pressure release and sheeting where layers of rocks have peeled awaay leaving behind rounded rock surfaces. can be up to 15m thick. e.g. Stone Mountain in Georgia and Half Dome in Yosemite.