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