Addiction: Central nervous system (CNS) stimulants are addictive, even if they are not abused. Many factors, including the patient's personal history, the type of stimulant that is being taken, the dose of the drug, and duration of use, influence how likely an individual is to become addicted.
The source of all waves - mechanical or electromagnetic - is something that is vibrating. Matthew Donovan.
Most waves form when winds blowing across the water's surface transmit their energy to the water. crest. the highest part of a wave. wavelength. the horizontal distance between crests. frequency. the number of waves that pass a point in a certain amount of time.