Nicotine dependence is now recognized as a psychoactive substance dependence disorder (DSM-IV, ICD-10). Under the DSM-IV criteria smokers are classified as dependent if they exhibit impaired control and continue to smoke despite awareness that it exacerbates a medical condition, and if they experience withdrawal symptoms when abstaining from smoking, or if they have a history of unsuccessful attempts at quitting.
The Earth's outer core is most likely made up of an iron-nickel alloy while the inner core mostly iron and a bit of nickel and cobalt. This is due to inferences that iron, cob â¦ alt and nickel are denser than other materials found at different levels in the structure of Earth, such as magnesium in the mantle.
What two metals are found in the inner and outer cores? Iron and nickel compose the bulk of the inner and outer core of the Earth. The bulk of the inner and outer cores, around 80%, are composed of iron. A substantial amount, aroun â¦ d 10%, is composed of nickel, and the remainder is a mixture of other elements.