This higher density has the effect that at subduction zones the oceanic lithosphere invariably sinks underneath the overriding lithosphere, which can be oceanic or continental. New oceanic lithosphere is constantly being produced at mid-ocean ridges and is recycled back to the mantle at subduction zones.
poor. adj. poorÂ·er, poorÂ·est. 1. a. Having insufficient wealth to meet the necessities or comforts of life or to live in a manner considered acceptable in a society. b. Relating to or characterized by poverty: the poor side of town. 2. Deficient or lacking in a specified resource or quality: an area poor in timber and coal; a diet poor in calcium. 3. Not adequate in quality or quantity; inferior: a poor performance; poor wages.
1 adj Someone who is poor has very little money and few possessions. , (Antonym: rich) The reason our schools cannot afford better teachers is because people here are poor..., He was one of thirteen children from a poor family. The poor are people who are poor., n-plural the N. Even the poor have their pride. 2 adj The people in a poor country or area have very little money and few possessions. , (Antonym: rich) Many countries in the Third World are as poor as they have ever been., ...a settlement house for children in a poor neighborhood. 3 adj You use poor to express your sympathy for someone.