Igneous Rocks Igneous rocks are formed by the cooling of molten rock. Group # 1. It is an intrusive rock. Which statement also accurately describes this rock? Intrusive Igneous Rocks: When the rising magmas during a volcanic activity do not reach the earth’s surface rather they are cooled and solidfied below the surface of the earth, the resultant igneous rocks are called intrusive igneous rocks. Igneous rocks are common in the geologic record, but surprisingly, it is the intrusive rocks that are more common. What determines igneous rock texture? It has a coarse texture. An igneous rock has small, dark crystals. Compare and contrast extrusive igneous rocks from intrusive igneous rocks in process of formation, cooling time, crystal size and example. 3) Use information about the ‘characteristics’ and/or the ‘mineral composition’ to refine your choices to one igneous rock. 4.1.3: Igneous Rock Bodies. Determination of intrusive and extrusive igneous rocks. There are two major states of molten rock: Magma and Lava. 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. Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. There are two major classifications of igneous rocks: Intrusive and Igneous rocks are extrusive and intrusive. Extrusive Igneous Rocks. The cooling process may be fast or slow, and determines the color and texture of the intrusive rock. - 5502329 Lava is the term given to magma once it reaches the Earth’s surface, usually in the form of a volcanic eruption. Slow cooling means the individual mineral grains have a very long time to grow, so they grow to a relatively large size. The size of the interlocking crystals gives information on depth of origin •Large crystals form in intrusive igneous rocks, because they crystalize at depth and thus cool very slowly •Small crystals (you can barely see without magnification), form in extrusive igneous rocks … Extrusive, or volcanic, igneous rock is produced when magma exits and cools outside of, or very near the Earth's surface. Intrusive Igneous Rocks 2. It was found on Earth's surface. Please update your bookmarks accordingly. Intrusive rocks have a coarse grained texture. Properties of Igneous Rock Textures . Other factors include the diffusion rate, which is how atoms and molecules move through the liquid. Extrusive rocks are formed from magma above the surface, while intrusive igneous rocks form from magma beneath the surface. These coarse-grained crystals make the rock look sugary as the flat crystal faces reflect the light in hundreds of little sparkles. 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