This list of sources is for a research paper on the dangers of cell phone use on the road. use of a cell phone in the classroom, at a movie theater, or during dinner with a friend can be distracting or irritating, but the use of cell phones while driving is worse, because it puts lives at risk
source 3
author: matt sundeen
article title: cell phones and highway safety: 2000 state legislative update
periodical name: national conference of state legislatures
publisher name: national conference of state legislatures
publication date: december 15, 2000
medium: web
date accessed: february 27, 2014

answer; i believe the answer is hydraulic action;

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.