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