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.
Stack â Further backward erosion into a headland resulting in a collapsed arch and the formation of a sea stack. An example of this is at Botany Bay in Kent (see Bay, for picture). Coastal Landforms Tombolo â Sea ward deposition of sediment linking the mainland to an island.We have no tombolo within the south east boundaries; however good examples include Holy Island, Northumberland, St Michaelâs Mount, Cornwall, and the Isle of Portland.oastal Landforms Beach â an area of coastal sediment accumulation at the land-sea boundary. The beach is the first line of defence for coastal protection. The beaches along our coastline are characterised by shingle, sand, shell and shale. Delta â Deposition of fluvial sediments into the coastal waters.