Waves begin to "feel bottom" when the depth of water is equal to one-half the wavelength equal to the wavelength twice as great as the wavelength three times as great as the wavelength

Waves begin to "feel bottom" when the depth of water is equal to one-half the wavelength. As the wave approach a shallow shore, its path is altered. This distortion caused the waves to become slow. As the wave becomes higher, the length of the wave decreases.

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.

Ibelieve it was because of the gas act in order to preserve fuel