difference between intrusive and extrusive igneous rocks


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Examples of intrusive rocks include granite, gabbro, and pegmatite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Granite is a common intrusive rock. Extrusive Rocks. Each kind of texture has a variety of different characteristics that make them unique. Igneous rocks are extrusive and intrusive. Intrusive rocks form as intrusions into country rock whereas extrusive rocks form on the surface. Earth Science. Intrusions are formed inside country rock which prevents the magma (=molten rock) intrusion from cooling quickly. This means that the rock is “Igneous”. Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form. Intrusive is also known as Plutonic igneous rocks. Other examples are Sill, Dyke e.t.c Extrusive is also known as Volcanic igneous rocks. The magma can be contained within the Earth’s crust and protected from the atmosphere. The MAIN difference is that extrusive/volcanic landforms exist, and intrusive landforms don’t. There are nine main types of igneous rock textures: Phaneritic, vesicular, aphanitic, porphyritic, poikilitic, glassy, pyroclastic, equigranular, and spinifex. Surrounded by pre-existing rock (called country rock), the magma cools slowly, and as a result these rocks are coarse grained. Igneous rock form as intrusive (plutonic) rocks below the surface and extrusive (volcanic) rocks form on the surface. Extrusive rocks would have smaller crystals because they had no insulation of surrounding rocks and cooled faster. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet. If the magma forces its way to the surface, it is then called lava, which cools and hardens into extrusive rocks. Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Intrusive igneous rocks are formed when magma cools slowly below the surface, while extrusive rocks … The rock that we see, except for meteorites that come from space, is formed from magma. - Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet. E.g: Granite rocks have been cooled slowly and contain large crystals. Temperature and pressure are crucial in determining the rate of solidification meaning the crystallization of a rock mass. Igneous Rocks: Igneous rocks are classified into two groups: intrusive and extrusive. Intrusive rocks form INSIDE the earth. Magma cools quicker on the earth's surface, extrusive igneous formed, as opposed to below the crust, intrusive. The Difference between Intrusive and Extrusive Igneous Landforms. How do petrologists use grain size to tell the difference between intrusive and extrusive igneous rocks? The two main categories of igneous rocks are extrusive and intrusive. This is called “Igneous Intrusive”. Extrusive rocks are formed from magma above the surface, while intrusive igneous rocks form from magma beneath the surface. The cooling process may be fast or slow, and determines the color and texture of the intrusive rock. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Notice the large grains of pink, white, and gray minerals. The crystal growth of intrusive igneous is substantially more so than extrusive igneous. They have been solified in the crust and they can be seen on the surface after a prolonged erosion. Earth 's surface, extrusive igneous rocks erupt onto the surface and extrusive, as opposed to the... ) rocks below the crust of the planet protected from the atmosphere temperature and pressure are crucial in the... Erupt onto the surface, extrusive igneous rocks for meteorites that come from space, is from! 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