Identification of Types of Volcanoes
It’s explicit that volcanoes have a tendency of frequently eroding away after a given time thereby making it difficult for them to be preserved in a geological record. However, it is assumed that various types of volcano deposits found in rocks are associated with various types of volcanoes. Rocks vary in various aspects like weight, color, and alignment. For instance, types of rocks like igneous, basalt, andesite, and rhyolite which are formed by various volcanic deposits from different volcanoes can be used to determine the type of volcanoes that erupted in a given area (Fradin & Fradin, 2007).
The types of volcanoes that erupted in a given area can be identified by analyzing the features of rocks found in that place and relating them to the features of various types of volcanoes. For instance, shield volcanoes develop from basalt magma. Therefore, an area that contains basalt rocks that are usually heavy and dark clearly indicates that shield volcanoes erupted in such place for example, the Giant’s Causeway found in Ireland. A region that contains andesite rocks that are light in color and contain more silica and less iron is said to have experienced cone volcanoes. The presence of rhyolite rocks for example the obsidian rocks which are light to the extent that some are white in an area is an indication that either stratovolcanoes or shield volcanoes erupted in such place (“Types of volcanic rock | Science Learn Hub,” n.d.).
Therefore, it evident that a close study of different types of rocks present in a given area will aid in identification of the volcanoes that erupted in that particular region. These rocks are differentiated in terms their color, weight, silica and iron content. Hence, as volcanoes erode away over time, it is the type of rocks found in a place that will determine the type of volcanoes that existed in that area (Fradin & Fradin, 2007).
Fradin, J. B., & Fradin, D. B. (2007). Volcanoes. Washington, DC: National Geographic.
Types of volcanic rock | Sciencelearn Hub. (n.d.). Retrieved from http://sciencelearn.org.nz/Contexts/Volcanoes/Science-Ideas-and-Concepts/Types-of-volcanic-rock