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.
Three landforms created by wind are; sand dunes, yardangs (half-teardrop shaped formations hill sized, and deflation hollows (wind swept depressions.
Wave cut platforms. The sea cliff is the most widespread landform of coastal erosion. Cliffs begin to form when destructive waves attack the bottom of the rock face between the high and low water marks. By the wave processes such as hydraulic power and abrasion, the waves undercut the face forming a wave-cut notch.ave cut platforms. The sea cliff is the most widespread landform of coastal erosion. Cliffs begin to form when destructive waves attack the bottom of the rock face between the high and low water marks. By the wave processes such as hydraulic power and abrasion, the waves undercut the face forming a wave-cut notch.