Methylphenidate is a commonly prescribed psychostimulant and works by increasing the activity of the central nervous system. It produces such effects as increasing or maintaining alertness, combating fatigue, and improving attention. The short-term benefits and cost effectiveness of methylphenidate are well established.
(image copied from here). 1  Igneous Rocks: form by crystallizing melted material (magma). 2  They can form either on the surface (extrusive igneous rocks), or deep in the crust (intrusive or plutonic igneous rocks).
Igneous rocks are formed around hot spots when there is an increase  in temperature, a decrease in pressure, or a change in composition.  Igneous rock is formed through the â¦ cooling and solidification of  magma or lava.ntrusive igneous rock: magma cools and hardens in the earth and later forms an intrusive igneous rock. extrusive igneous rock: magma flows onto earth's surface and becomes â¦ lava. Then, lava cools and hardens above earth's surface and later forms an extrusive igneous rock.