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difference between intrusive and extrusive igneous rocks

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