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.
There are various sources of the material in the sea. 1  The material has been: 2  eroded from cliffs. 3  transported by longshore drift along the coastline. 4  brought inland from offshore by constructive waves. 5  carried to the coastline by rivers.