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.
Landforms of fluvial erosion and deposition. Oxbow lakes and meanders are found in the middle course of the river (long profile) and are formed as a result if erosion and deposition. The formation of meanders leads eventually to the development of oxbow lakesVideo showing the features of the middle course of the River Tay -. http://www.bbc.co ....