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Determination of intrusive and extrusive igneous rocks. 6 Answers. Intrusive igneous rocks come from magma, forming deep underground and taking longer to cool, meaning they form larger crystals. Intrusive, or plutonic igneous rock forms when magma is trapped deep inside the Earth. The chemical composition of diorite is intermediate between gabbro and granite. Examples include basalt, rhyolite, andesite, and obsidian. We have moved all content for this concept to for better organization. Relevance. Sodium (Na) 2 Types of Igneous Rocks Intrusive Rock forms when magma cools and solidifies inside the Earth. (Extrusive = Exits the Earth) Sediments are small pieces of rock that are moved by water, wind, and gravity. - 5502329 Some of the Igneous Rocks rocks are Granite, Obsidian, Basalt, Diorite, Gabbro. Favourite answer. If the body has an exposed surface area greater than 100 km2, then it’s a batholith, otherwise it’s a stock. Get an answer for 'Compare and contrast the types of igneous rocks.' Answer Save. Most extrusive (volcanic) rocks have small crystals. Get to know the difference between the two Igneous Rocks by comparing their properties, features, texture, uses and appearance. Lv 7. A pluton is a block of intrusive igneous rock. Skechers. Igneous rocks: intrusive (plutonic) versus extrusive (volcanic) rocks formed from magma - an overview. ... Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene. However, extrusive rocks form from lava at the surface of the Earth, whereas intrusive rocks form from magma underground, often relatively deep in the Earth. Great globs of molten rock rise toward the surface. Characteristics A body of intrusive igneous rock which crystallizes from magma cooling underneath the surface of the Earth is called a pluton.If the pluton is large, it may be called a batholith or a stock depending on the area exposed at the surface. (Intrusive = Inside) Extrusive Rock forms when lava cools and solidifies outside the Earth’s crust. Potassium (K) 8. You can also go through the reserves of Igneous Rocks. Compare and contrast extrusive igneous rocks from intrusive igneous rocks in process of formation, cooling time, crystal size and example. 1 decade ago. Thats what intrusive and extrusive is... A igneous rock. Neither, Igneous rock is either intrusive or extrusive. Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Compare and contrast extrusive and intrusive igneous rock.? Please update your bookmarks accordingly. 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