Related words. 1  poke noun. 2  poke around phrasal verb. 3  poke fun (at) phrase.  a pig in a poke 1  phrase. poke a hole in something phrase.  poke/shove/stick your nose into something 1  phrase. poke about phrasal verb at poke around.  poke fun at phrase at make fun of.
Because the subduction zone (which is also the plate boundary) is generally an arc-shape, geologists named those volcanoes volcanic arcs. A volcanic arc built on continental crust is called a continental arc; when built on oceanic crust the volcanoes form an island arc. Volcanic arcs are made of an arc-shaped chain of volcanoes. 2  The position of which could be continental or mid-ocean. 3  While an island arc must be offshore and does not necessarily be volcanic (e.g. Hellenic arc).
Typified by 1. Alaskaâs Aleutian Islands 2. Andes of western South America B. Aleutian-type mountain building 1. Where two ocean plates converge and one is subducted beneath the other 2. Volcanic island arcs result from the steady subduction of oceanic lithosphere a. Most are found in the Pacific b. Active island arcs include 1. Mariana arc 2. New Hebrides arc 3. Tonga arc 4. Aleutian arc c. Continued development can result in the formation of mountainous topography consisting of igneous and metamorphic rocks C. Andean-type mountain building 1. Mountain building along continental margins a.