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What is Basalt? Intrusive Rocks Igneous rocks which form by the crystallization of magma at a depth within the Earth are called intrusive rocks. 2) Extrusive rocks or Volcanic rocks When magma does reach the surface during a volcanic eruption, the rocks that form there are called lavas or volcanic rocks. Scoria (type of crust/plate tectonic setting) continental, convergent. We have moved all content for this concept to for better organization. vesicular Basalt (intrusive or extrusive) extrusive. Image credit: Yes058/Shutterstock.com. Extrusive rocks erupt from volcanoes or seafloor fissures, or they freeze at shallow depths. Gabbro and basalt are both igneous rocks. The cinder cone above and the close up at right are made of basalt . Diorite(minerals/color) felsic/intermediate. Therefore, they are typically fine-grained and gassy. Formation Of Extrusive Rocks Basalt is an extrusive ignerous rock. basalt-exrusive obsidian-extrusive pumice-extrusive granite-Intrusive Extrusive means its on the surface (on the ground). By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within Earth’s crust; the molten material then slowly solidifies below Earth’s surface, where it may later be exposed through erosion. Basalt is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Determination of intrusive and extrusive igneous rocks. Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. The basic classification is the same as for plutonic rocks: with increasing silica content, they include: basalt, … Before we discuss the extrusive quality of basalt, it's important to understand that it's an igneous rock. Pumice, obsidian, and basalt are all extrusive igneous rocks. Intrusive means its below the earth's surface(in the ground) The first 3 are also volcanic rocks, a couple forming in the event of an eruption (obsidian and pumice). Depending on where and how the magma cools, igneous rocks are described as either intrusive or extrusive. Please update your bookmarks accordingly. However, gabbro is an intrusive rock, and basalt is an extrusive rock. This means that they cool relatively quickly and under low pressures. This generally happens in volcanic areas, when volcanoes erupt or ooze magma. This occurs when magma bursts forth from the mantle or crust on to the surface. Intrusive igneous rock Intrusive, or plutonic igneous rock forms when magma is trapped deep inside the Earth. Igneous rocks — those which originate from magma — fall into two categories: extrusive and intrusive. Pumice (texture) vesicular. 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