It all comes down to the rate at which the rock cools. Determination of intrusive and extrusive igneous rocks. These crystals make a coarse-grained igneous rock called plutonic, or intrusive, igneous rock because the magma was intruded into cracks deep under the earthâs surface. Which statement also accurately describes this rock? Intrusive Rocks Igneous rocks which form by the crystallization of magma at a depth within the Earth are called intrusive rocks. Magma is a form of molten rock that exists below the Earthâs surface. The size of the interlocking crystals gives information on depth of origin â¢Large crystals form in intrusive igneous rocks, because they crystalize at depth and thus cool very slowly â¢Small crystals (you can barely see without magnification), form in extrusive igneous rocks ⦠The cooling process may be fast or slow, and determines the color and texture of the intrusive rock. We have moved all content for this concept to for better organization. There are two major states of molten rock: Magma and Lava. Igneous rocks are common in the geologic record, but surprisingly, it is the intrusive rocks that are more common. These coarse-grained crystals make the rock look sugary as the flat crystal faces reflect the light in hundreds of little sparkles. It was found on Earth's surface. Slow cooling means the individual mineral grains have a very long time to grow, so they grow to a relatively large size. Properties of Igneous Rock Textures . Extrusive rocks are formed from magma above the surface, while intrusive igneous rocks form from magma beneath the surface. Please update your bookmarks accordingly. It was formed from slow cooling. Intrusive rocks have a coarse grained texture. Lava is the term given to magma once it reaches the Earthâs surface, usually in the form of a volcanic eruption. Extrusive Igneous Rocks. An igneous rock has small, dark crystals. Igneous rocks are extrusive and intrusive. What determines igneous rock texture? Intrusive Igneous Rocks 2. Other factors include the diffusion rate, which is how atoms and molecules move through the liquid. There are two major classifications of igneous rocks: Intrusive and Compare and contrast extrusive igneous rocks from intrusive igneous rocks in process of formation, cooling time, crystal size and example. It is an intrusive rock. Intrusive Igneous Rocks: When the rising magmas during a volcanic activity do not reach the earthâs surface rather they are cooled and solidfied below the surface of the earth, the resultant igneous rocks are called intrusive igneous rocks. Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. Extrusive rocks, because of their small crystals and glass, are less durable. - 5502329 Igneous Rocks Igneous rocks are formed by the cooling of molten rock. 4.1.3: Igneous Rock Bodies. Group # 1. 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