Sedimentary, metamorphic and igneous. Extrusive igneous rocks form from magma that erupted onto the surface as lava, where it cooled quickly. Intrusive Igneous Rocks Most magma does not extrude onto Earth's surface but cools slowly deep inside Earth. Intrusive igneous rocks The following links show 3D examples of intrusive igneous rocks. Igneous rock - Igneous rock - Intrusive igneous rocks: Erosion of volcanoes will immediately expose shallow intrusive bodies such as volcanic necks and diatremes (see Figure 6). Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Intrusive rocks are classified the same way extrusive rocks are—according to the relative amounts of feldspars, quartz, and ferromagnesian minerals. Igneous rocks with smaller crystals tend to be smoother and have a glassy appearance. What does extrusive mean? Igneous Rocks are formed by cooling or solidification of molten or partly molten material, i.e. Igneous rocks are first formed rocks which had made up the primodial earth’s crust. Intrusive igneous rocks Intrusive igneous rocks are formed when magma solidifies below the earth’s surface. Igneous rocks are divided into two categories, intrusive or extrusive, depending on where the magma solidifies (USGS, 2004). Intrusive Igneous Rocks 2. Igneous rocks are fashioned deep internal Earth's crust (intrusive rocks) or on the floor (extrusive rocks). This very molten rock will slowly cool over many years until it becomes solid. Examples of extrusive igneous rocks are Basalt( Deccan plateau of India is made of Basalts), Pumice( use to make lightweight concrete), Obsidian( use to make ornaments), etc and intrusive rocks are Granite ( use to make buildings and roads), Diorite( use … The magmatism at divergent plate boundaries along the crests of the oceanic rises and ridges is mostly unseen except in places where the volcanic activity occurs subaerially (e.g., Iceland, which sits on the Mid-Atlantic Ridge). Intrusive igneous rocks are generally formed from magma that cools and solidifies within the Earth's crust and is surrounded by pre-existing rock. Derived from magma poured out or ejected at the earth's surface. Acid igneous rocks have silica content from 65–85 percent. Igneous rocks are classified into two groups depending upon where the molten rock solidifies: Extrusive or Intrusive. In this article we will list out several examples of igneous rocks with some brief information about them. In geology, an igneous intrusion (or intrusive body[1] or simply intrusion[2]) is a body of intrusive igneous rock that forms by crystallization from magma slowly cooling below the surface of the Earth. On the other hand, intrusive igneous rocks form … Intrusive Igneous Rocks The slow cooling of molten rock under the Earth’s surface creates the large crystals in intrusive igneous rocks.Intrusive rocks are also called plutonic rocks.Examples of intrusive igneous rocks are: diorite It is made up of quartz, feldspar and mica.It is commonly used as a building material. Origin of Igneous Rocks The igneous rocks are formed at high temperature directly … Click on the models to view them in 3D The extrusive rocks , volcanic also called, are formed as a result of cooling lava on the surface of the earth. A volcanic neck is the “throat” of a volcano and consists of a pipelike conduit filled with hypabyssal rocks. The models are organised in rough order from the most silicon-rich rocks to the least silicon rich rocks. Examples of intrusive rocks include granite, gabbro, and pegmatite. The sedimentary rocks are affected by many dikes and sheets of igneous rock, some of the latter being extrusive and some intrusive. Komatiite is a very rare and old extrusive igneous rock. They generally lack in iron and magnesium.Granite is an acid igneous rock. Igneous Rock Category Essay Examples Essay type Research Words 340 (1 page) Views 170 Igneous rocks originate from deep within the Earth’s crust. ADVERTISEMENTS: The igneous rocks are more commonly classified on the basis of the mode of occurrence into two major groups:- 1. Igneous rocks are crystalline in structure, sedimentary rocks tend to be fragmentary and stratified whereas metamorphic rocks are either foliated or non-foliated. 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