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.
Quality (business), the non-inferiority or superiority of something; Quality (philosophy), an attribute or a property; Quality (physics), in response theory; Energy quality, used in various science disciplines; Logical quality; Vapor quality, in thermodynamics, the ratio of mass of vapor to that of vapor and liquid Service quality, comparison of expectations with performance in a service Music