Extrusive rocks, because of their small crystals and glass, are less durable. Group # 1. Igneous rocks are common in the geologic record, but surprisingly, it is the intrusive rocks that are more common. Which statement also accurately describes this rock? It is an intrusive rock. We have moved all content for this concept to for better organization. Intrusive Rocks Igneous rocks which form by the crystallization of magma at a depth within the Earth are called intrusive rocks. It was formed from slow cooling. Extrusive Igneous Rocks. Slow cooling means the individual mineral grains have a very long time to grow, so they grow to a relatively large size. Intrusive rocks have a coarse grained texture. These coarse-grained crystals make the rock look sugary as the flat crystal faces reflect the light in hundreds of little sparkles. The cooling process may be fast or slow, and determines the color and texture of the intrusive rock. Lava is the term given to magma once it reaches the Earthâs surface, usually in the form of a volcanic eruption. Determination of intrusive and extrusive igneous rocks. Igneous rocks are extrusive and intrusive. Please update your bookmarks accordingly. 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. Compare and contrast extrusive igneous rocks from intrusive igneous rocks in process of formation, cooling time, crystal size and example. There are two major classifications of igneous rocks: Intrusive and Other factors include the diffusion rate, which is how atoms and molecules move through the liquid. Intrusive Igneous Rocks 2. An igneous rock has small, dark crystals. It has a coarse texture. Magma is a form of molten rock that exists below the Earthâs surface. It all comes down to the rate at which the rock cools. Extrusive igneous rock (that was formed after being erupted from a volcano) will have a much smaller crystal size than an intrusive igneous rock. 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 ⦠4.1.3: Igneous Rock Bodies. Extrusive, or volcanic, igneous rock is produced when magma exits and cools outside of, or very near the Earth's surface. It was found on Earth's surface. Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. What determines igneous rock texture? 3) Use information about the âcharacteristicsâ and/or the âmineral compositionâ to refine your choices to one igneous rock. Igneous Rocks Igneous rocks are formed by the cooling of molten rock. 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. 2) Use information about texture, grain size, intrusive or extrusive, vesicular or non-vesicular to narrow your choices to certain igneous rocks that fit the information in the question. Extrusive rocks are formed from magma above the surface, while intrusive igneous rocks form from magma beneath the surface. - 5502329 Properties of Igneous Rock Textures . There are two major states of molten rock: Magma and Lava. Glass, are less durable rock look sugary as the flat crystal faces reflect the in. Are less durable Earthâs surface small crystals and glass, are less durable look sugary as the flat crystal reflect... Once it reaches the Earthâs surface called intrusive rocks, which is how and... 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