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).
Sorry, something has gone wrong. Trending Now. Answers. Best Answer: The two processes that form igneous rocks are: 1) rocks melt and are intruded into preexisting rocks, and 2) rocks melt and are extruded onto the surface of the Earth (either dry land or on the ocean floor).