Correctly label the following generalized volcano shapes as shield volcano or st
ID: 298564 • Letter: C
Question
Correctly label the following generalized volcano shapes as shield volcano or stratovolcano. At a convergence boundary between ocean plates, one sea floor plate subducts beneath the other. The results are an ocean trench, occasional earthquakes and island are volcanoes. The basic rocks of sea floor are composed of mafic (basaltic) minerals. Explain why the volcanoes of island arcs are stratovolcanoes instead of shield volcanoes? (The answer to this on is in the presentation about convergence volcanoes.)Explanation / Answer
Answer : since shield volcanoes have gentle slopes , the first one is shield volcano. Strato or composite volcanoes have steep sided slopes so the second one S strato volcanoe.
Shield volcanoes are made-up of basaltic lava while composite volcanoes are made-up of silicic or granitic lavas